#include <iostream>
using namespace std;
int main()
{
	char a,b,c;
cin >> a >> b >> c;
cout << c << b << a;
	return 0;
}

#include <iostream>
using namespace std;

int main()
{
	char a,b,c;
cin >> a >> b >> c;
cout << c << b << a;
	return 0;
}

#include <iostream>
using namespace std;

int main()
{
	char a,b,c;
cin >> a >> b >> c;
cout << c << b << a;
	return 0;
}

#include using namespace std; int main(){ char a,b,c; cin>>a>>b>>c; cout<<c<<b<<a; return 0; }

#include using namespace std; int main(){ char a,b,c; cin>>a>>b>>c; cout<<c<<b<<a; return 0; }

#include<iostream>
using namespace std;
int main(){
	int a;
	cin>>a;
	cout<<a%10<<a/10%10<<a/100;
} 

#include<bits/stdc++.h>
using namespace std;
string a;
int main(){
	cin>>a;
	int t=a.size();
	for(int i=t-1;i>=0;i--) cout<<a[i];
	return 0;
}

字符串逆序秒了

`

#include<iostream>
using namespace std;
int main(){
	int a;
	cin>>a;
	cout<<a%10<<a/10%10<<a/100;
}

#include <bits/stdc++.h>
using namespace std;
int main(int argc, char **argv){
	char n[3];
	for (int i = 0;i < 3;i++){
		cin >> n[i];
	}
	for (int i = 2;i >= 0;i--){
		cout << n[i];
	}
	return 0;
}