#include <stdio.h>
int main(void) {
char array[101];
scanf("%100[0-9a-zA-Z\n]", array
); return 0;
}
I2luY2x1ZGUgPHN0ZGlvLmg+CgppbnQgbWFpbih2b2lkKSB7CgljaGFyIGFycmF5WzEwMV07CiAgICBzY2FuZigiJTEwMFswLTlhLXpBLVpcbl0iLCBhcnJheSk7CiAgICBwcmludGYoIiVzIiwgYXJyYXkpOwoJcmV0dXJuIDA7Cn0=