>>593
#include<stdio.h>
#include<string.h>
int mycmp(char* s1,char* s2){return strncmp(s1,s2,256)==0;}
int main(void){char s1[256],s2[256];fgets(s1,256,stdin);fgets(s2,256,stdin);
puts(mycmp(s1,s2)?"yes.":"no.");return 0;}