include <iostream>

using namespace std;
int main() {
string s,t;
int n, i=0,a,e;
getline(cin,s);
n=s.length();
while (i<n) {
i+=2;
t=s.substr(i-2,2);
if (t<"97") {
i++;
t+=s[i];
}
a=stoi(t);
cout<<char(a);
}
cout<<endl;
return 0;
}