#include<iostream> // cin\cout\endl #include<cstdio> //scanf()\printf() using namespace std; int main(){ char a[151],b[151]; int s=0,n=0; cin>>a>>b; while(a[s]!='\0'){ s++;} while(b[n]!='\0'){ n++;} if(s==n) cout<<"yes"; else cout<<"no"; return 0; }