Red Huang

//============================================================================  
// Name        : Meeting Prof. Miguel.cpp  
// Date : 2013/3/24 下午10:22:31  
// Author : GCA  
//============================================================================  
#include <iostream>  
#include <cstdio>  
#include <cstring>  
#include <algorithm>  
#include <cmath>  
#include <climits>  
#include <vector>  
#include <set>  
#include <map>  
#include <queue>  
#include <cctype>  
#include <utility>  
using namespace std;  
#ifdef ONLINE\_JUDGE  
#define ll "%lld"  
#else  
#define ll "%I64d"  
#endif  
typedef unsigned int uint;  
typedef long long int Int;  
#define Set(a,s) memset(a,s,sizeof(a))  
#define Write(w) freopen(w,"w",stdout)  
#define Read(r) freopen(r,"r",stdin)  
#define Pln() printf("\\n")  
#define I\_de(x,n)for(int i=0;i<n;i++)printf("%d ",x\[i\]);Pln()  
#define De(x)printf(#x"%d\\n",x)  
#define For(i,x)for(int i=0;i<x;i++)  
#define CON(x,y) x##y  
#define Pmz(dp,nx,ny)for(int hty=0;hty<ny;hty++){for(int htx=0;htx<nx;htx++){\\  
    printf("%d ",dp\[htx\]\[hty\]);}Pln();}  
#define M 30  
#define PII pair<int,int\>  
#define PB push\_back  
#define oo (INT\_MAX>>1)-2  
#define Set\_oo 0x3f  
#define Is\_debug true  
#define debug(...) if(Is\_debug)printf("DEBUG: "),printf(\_\_VA\_ARGS\_\_)  
#define FOR(it,c) for(\_\_typeof((c).begin()) it=(c).begin();it!=(c).end();it++)  
#define eps 1e-6  
bool xdy(double x,double y){return x>y+eps;}  
bool xddy(double x,double y){return x>y-eps;}  
bool xcy(double x,double y){return x<y-eps;}  
bool xcdy(double x,double y){return x<y+eps;}  
int min3(int x,int y,int z){  
    int tmp=min(x,y);  
    return min(tmp,z);  
}  
int max3(int x,int y,int z){  
    int tmp=max(x,y);  
    return max(tmp,z);  
}  
int ymz\[M\]\[M\];  
int mmz\[M\]\[M\];  
char cms,cys;  
int ms,ys;  
int n,m;  
void floyd(){  
    for(int k=0;k<27;k++){  
        for(int i=0;i<27;i++){  
            for(int j=0;j<27;j++){  
                if(ymz\[i\]\[k\]+ymz\[k\]\[j\]<ymz\[i\]\[j\]){  
                    ymz\[i\]\[j\]=ymz\[i\]\[k\]+ymz\[k\]\[j\];  
                }  
            }  
        }  
    }  
    for(int k=0;k<27;k++){  
        for(int i=0;i<27;i++){  
            for(int j=0;j<27;j++){  
                if(mmz\[i\]\[k\]+mmz\[k\]\[j\]<mmz\[i\]\[j\]){  
                    mmz\[i\]\[j\]=mmz\[i\]\[k\]+mmz\[k\]\[j\];  
                }  
            }  
        }  
    }  
    int ans=oo;  
    bool noway=true;  
    for(int i=0;i<M;i++){  
        if(ans>mmz\[ms\]\[i\]+ymz\[ys\]\[i\]){  
            ans=mmz\[ms\]\[i\]+ymz\[ys\]\[i\];  
            noway=false;  
        }  
    }  
    if(noway)printf("You will never meet.\\n");  
    else{  
        printf("%d",ans);  
        for(int i=0;i<M;i++){  
            char ctmp=i+'A';  
            if(ans==mmz\[ms\]\[i\]+ymz\[ys\]\[i\])printf(" %c",ctmp);  
        }Pln();  
    }  
  
}  
int main() {  
    ios\_base::sync\_with\_stdio(0);  
    while(~scanf("%d%\*c",&m)&&m){  
        char a,b,c,d;  
        int w;  
        fill(&ymz\[0\]\[0\],&ymz\[M-1\]\[M-1\],oo);  
        fill(&mmz\[0\]\[0\],&mmz\[M-1\]\[M-1\],oo);  
        for(int i=0;i<M;i++){  
            ymz\[i\]\[i\]=0;  
            mmz\[i\]\[i\]=0;  
        }  
        for(int i=0;i<m;i++){  
            scanf("%c %c %c %c %d%\*c",&a,&b,&c,&d,&w);  
            if(a=='Y'){  
                ymz\[c-'A'\]\[d-'A'\]=min(ymz\[c-'A'\]\[d-'A'\],w);  
                if(b=='B')ymz\[d-'A'\]\[c-'A'\]=min(ymz\[d-'A'\]\[c-'A'\],w);  
            }else{  
                mmz\[c-'A'\]\[d-'A'\]=min(mmz\[c-'A'\]\[d-'A'\],w);  
                if(b=='B')mmz\[d-'A'\]\[c-'A'\]=min(mmz\[d-'A'\]\[c-'A'\],w);  
            }  
        }  
  
        scanf("%c %c%\*c",&cys,&cms);  
        ms=cms-'A';  
        ys=cys-'A';  
        floyd();  
    }  
  
}