#include<iostream>

#include "BigIntegerLibrary.hh"

using namespace std;

int main(){
char mode;
cout<<"Press 'C' code or other to decode"<<endl;
cin>>mode;
if(mode=='C'){
string s;
BigInteger cislo=0;
cin>>s;
for(int i=s.length()-1; i>=0; i--)
cislo=cislo*150+(int)s[i];


cout<<cislo<<endl;
}
else{
BigInteger cislo;
string s;
cin>>s;
cislo=stringToBigUnsigned(s);

while(cislo>0){
cout<<(char)(cislo%150).toUnsignedLong();
cislo/=150;
}
cout<<endl;
}
}