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#include<stdio.h>
#include<string.h>
#include<algorithm>
using namespace std;
int a[300],len[25];
char  str[25][1000];
int get_num(int i,int &p)
{
    if(str[i][p]>='A'&&str[i][p]<='Z')
        return a[str[i][p++]];
    int num=0;
    while(str[i][p]!='<'&&p<len[i])
        num=num*10+str[i][p++]-'0';
    return num;
}
int main()
{
    char ch;
    int x,y,n,m;
    //freopen("in.txt","r",stdin);
    while(scanf("%d",&n)!=EOF)
    {
        memset(a,0,sizeof(a));
        for(int i=1;i<=n;i++){
            scanf("%s",str[i]);
            len[i]=strlen(str[i]);
            for(int j=0;j<len[i];j++)
                a[str[i][j]]=1;
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