123

# include<bits/stdc++.h>
using namespace std;
string s1,s2;
int main(){
getline(cin,s1);
getline(cin,s2);
int i,j=0;
for(i=0;i<=s1.length();i++){
if(s1[i]==s2[j]){
j++;
if(j==s2.length()){
cout<<"yes";
return 0;
}
}
else{
j=0;
}
}
cout<<"no";
return 0;
}