#include <stdio.h>
int main(void) {
int n;
if (n < 0) {
}
return 0;
}
I2luY2x1ZGUgPHN0ZGlvLmg+CgppbnQgbWFpbih2b2lkKSB7CiAgICBpbnQgbjsKICAgIHNjYW5mKCIlZCIsICZuKTsKICAgIAogICAgaWYgKG4gPCAwKSB7CiAgICAgICAgcHJpbnRmKCIlZFxuIiwgbik7CiAgICB9CiAgICAKICAgIHJldHVybiAwOwp9