#include<stdio.h>
#include<string.h>
int main()
{
    char s[1001][55];
    int t,sn,q,n,i,j,k;
    char c;
    scanf("%d",&t);
    for(i=1;i<=t;i++)
    {
        scanf("%d",&sn);
        for(j=1;j<=sn;j++)
        {
            scanf("%s",s[j]);
        }
        scanf("%d",&q);

        for(k=1;k<=q;k++)
        {
            scanf("%d %c",&n,&c);
             s[n][strlen(s[n])]=c;
             if(k==1) printf("Case %d:\n",i);
             printf("%s\n",s[n]);
        }





    }




}