#include <stdio.h>
struct c{
char s[25];
};
int main() {
struct c S[1000], S1[1000];
int n, sum=0;
scanf("%d", &n);
for(int i=0; i<n; i++) {
scanf("%s", S[i].s);
}
for(int i=0; i<n-1; i++) {
scanf("%s", S1[i].s);
}
for(int i=0; i<n-1; i++) {
for(int j=0; j<n; j++) {
int flag=1;
if(S1[i].s[0]==S[j].s[0]) {
//printf("%d %d :", i,j);
for(int k=0; S1[i].s[k]; k++) {
//printf("%c %c\n", S1[i].s[k],S[j].s[k]);
if(S1[i].s[k]!=S[j].s[k]) { flag=0; break;}
}
if(flag) {
sum+=j;
//printf("%d ", j);
break;
}
}
}
}
//printf("남은 번호 %d",n*(n-1)/2-sum );
printf("%s", S[n*(n-1)/2-sum].s);
return 0;
}
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