#include <stdio.h>
#define CONCAT(string) "start"string"end"
int main(void) {
return 0;
}
I2luY2x1ZGUgPHN0ZGlvLmg+CiNkZWZpbmUgQ09OQ0FUKHN0cmluZykgInN0YXJ0InN0cmluZyJlbmQiCgppbnQgbWFpbih2b2lkKSB7CgkgcHJpbnRmKENPTkNBVCgiLWhlbGxvLSIpKTsKCXJldHVybiAwOwp9