#include <stdio.h>
int main(void) {
write(1,"ef",2);
write(1,"gh",2);
return 0;
}
I2luY2x1ZGUgPHN0ZGlvLmg+CgppbnQgbWFpbih2b2lkKSB7CglwcmludGYoImFiIik7CglwdXRzKCIiKTsKCXByaW50ZigiY2QiKTsKCXB1dHMoIiIpOwoJd3JpdGUoMSwiZWYiLDIpOwoJcHV0cygiIik7Cgl3cml0ZSgxLCJnaCIsMik7CglyZXR1cm4gMDsKfQo=