#include<bits/stdc++.h> using namespace std; int main() { char s1[151],s2[151]; cin>>s1; cin>>s2; cout<<s1<<s2; int s1_l,s2_l; s1_l=0; s2_l=0; for(int i=0;1<151;i++){ if(s1[i]!='\0'){ s1_l++; } else{ break; } } if(s1_l==s2_l){ cout<<"yes"<<endl; }else cout<<"no"<<endl; return 0; }