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a #include<bits/stdc++.h>
using namespace std;
int main (){
string f6765765732;
getline(cin,f6765765732);
int e4263749=f6765765732.length();
bool tr13213=true;
for(int i=0;i<e4263749;i++){
if(f6765765732[i]!=f6765765732[e4263749-i-1]){
tr13213=false;
break;
}
}
if(tr13213){
cout<<"yes";
}
else{
cout<<"no";
}
return 0;
}
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