#include<bits/stdc++.h>
main(){int n,a,b,c,d,f[10]={},i,j;std::cin>>n;std::string s;for(i=n;i--;){std::cin>>a>>b>>c>>d>>s;if(s=="YES"){for(j=10;j--;)if(j!=a&&j!=b&&j!=c&&j!=d)f[j]=1;}else f[a]=f[b]=f[c]=f[d]=1;}for(i=10;i--;)if(!f[i])printf("%d",i);}