#include<stdio.h>
int main ()
{
int n;
int q,w,e,r,t,y;
scanf("%d%d%d%d%d%d" , &q,&w,&e,&r,&t,&y);
if (q/2==0);
printf("%d",q);
else if(w/2==0);
printf("%d",w);
else if(e/2==0);
printf("%d",e);
else if(r/2==0);
printf("%d",r);
else if(t/2==0);
printf("%d",t);
else if(y/2==0;
printf("%d",y);
else if
printf("no even digit");
return 0;
}