#include <iostream>
#include <algorithm>
using namespace std;
char op(char ch)
{

   if(ch>='A'&&ch<='Z')
        return ch+32;
    else
        return ch;
}
int main()
{
    string first,second;
    cin>>first;
    second.resize(first.size());
    transform(first.begin(),first.end(),second.begin(),op);
    cout<<second<<endl;
    return 0;
}