#include<iostream> #include<cstdio> //scanf()\printf() #include<cstring> #include<cmath> //sqrt()\pow()\abs()\ceil()\floor()\max()\min() using namespace std; int main(){ char a[101],b[101]; int n=strcmp,s1=strlen(a),s2=strlen(b); cin>>a>>b; strcat(a,b); n=strcmp(a,b); if(n==0) cout<<"yes"; else cout<<"no"; return 0; }