#include<bits/stdc++.h>
using namespace std;
int main()
{
    char b[20];
    cin>>b;
    for(int i = 0;i<strlen(b);i++)
    {
        if(b[i] >= 'A' && b[i] <= 'Z')
        {
            cout<<char(b[i]+32);
        }
        else if(b[i] >= 'a' && b[i] <= 'z')
        {
            cout<<char(b[i]-32);
        }
        else
        {
            cout<<b[i];
        }
    } 
}

/**************************************************************
	Problem: 1182
	User: wuyichen
	Language: C++
	Result: Accepted
	Time:10 ms
	Memory:2072 kb
****************************************************************/