
/*
TASK: CANNIBAL
LANG: C
*/

#include<stdio.h>

int i,j,num;
int a[2][128];

int main () {
    for (j=0;j<2;j++)
        for (i=0;i<102;i++) {
            scanf("%d",&a[j][i]);
            if (a[0][i]==-1) num=i;
            }
    if (i<51) {
       if (a[1][i+51]!=-1)
          printf("%d\n",a[1][i+51]);
       else printf ("%d\n",a[0][i+51]);
       }
    else {
         if (a[1][i-51]!=-1)
            printf("%d\n",a[1][i-51]);
         else printf ("%d\n",a[0][i-51]);
         }
    return 0;
    }
