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A.cpp
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/*****
__Bismillahir Rahmanir Rahim__
American International University Bangladesh (AIUB)
Hadiur Rahman Nabil
*****/
#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef long double ld;
typedef vector <int> vi;
#define pb push_back
#define mp make_pair
#define gcd(a,b) __gcd(a,b)
#define endl "\n"
const int mod = 1e9 + 7;
const double PI = 3.1415926535897932384626;
const int mod_2 = 998244353;
const int MAX=100005;
int main()
{
ios_base::sync_with_stdio(false);
cin.tie(NULL);
ll c=0,d=0;
string s;
cin>>s;
for(int i=1; i<s.size(); i++)
{
if(islower(s[i]))
{
c++;
}
}
for(int i=0; i<s.size(); i++)
{
if(isupper(s[i]))
{
d++;
}
}
if(islower(s[0]) && c==0)
{
s[0]=toupper(s[0]);
for(int i=1; i<s.size(); i++)
{
s[i]=tolower(s[i]);
}
cout<<s;
return 0;
}
if(d==s.size())
{
for(int i=0; i<s.size(); i++)
{
s[i]=towlower(s[i]);
}
cout<<s;
}
else
{
cout<<s;
}
}