#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;
}
