#include<iostream>
#include<cstring>
using namespace std;
char a[114514];
const int CAPS=32;
int main()
{
    cin.getline(a,114514);
    for(int i=0;i<strlen(a);i++)
    {
        if('A'<=a[i]&&a[i]<='Z')a[i]+=CAPS;
        else if('a'<=a[i]&&a[i]<='z')a[i]-=CAPS;
    }
    cout<<a;
    return 0;
}

#include <queue> 
#include <math.h> 
#include <stack> 
#include <stdio.h>
#include <iostream>
#include <vector> 
#include <iomanip> 
#include <string.h> 
#include <algorithm>
using namespace std;
#define LL long long
const int N = 1e5 + 10; 
const int INF = 0x3f3f3f3f; 
int a[N];
int main() 
{ 
string a;
getline(cin,a);
int x=a.size();
for(int j=0;j<x;j++)
{
    
    if(a[j]<91&&a[j]>='A')
    {
        a[j]+=32;
    }else if(a[j]<='z'&&a[j]>='a') a[j]-=32;
    
    cout<<char(a[j]);
}
}