#include <iostream>#include <stdio.h>#include <string.h>#include <algorithm>#include <queue>#include <cmath>using namespace std; int rc[30];int main(){ int n; int t=1; char a,b; bool f; int i; while(scanf("%d",&n),n) { memset(rc,0,sizeof(rc)); rc[0]=1; while(n--) { getchar(); scanf("%c = %c",&a,&b); rc[a-'a']=rc[b-'a']; } f=0; printf("Program #%dn",t++); for(i=0;i<26;i++)if(rc[i]) f=1,printf("%c ",i+'a'); if(!f) printf("none"); printf("nn"); }}
