#include<bits/stdc++.h> using namespace std; int main(){ int n; cin>>n; int ge,shi,bai,num; bai=n/100; ge=n%10; shi=(n-bai100-ge)/10; num=ge100+shi*10+bai; cout<<num; return 0; }

快得飞起

#include<bits/stdc++.h>
using namespace std;
int main(){
	cout<<(getchar()^'0')+(getchar()^'0')*10+(getchar()^'0')*100;
	return 0;
}

#include<bits/stdc++.h> using namespace std; int main(){ int a,s,d; cin>>a; s=a/100; d=a%10; cout<<a+99d-99s; }

#include<bits/stdc++.h> 
using namespace std;
int main(){
	int n;
	cin>>n;
	if(n%100%10==0){
	cout<<n/10%10<<n/100;
	}else{
	cout<<n%100%10<<n/10%10<<n/100;	
	}
	return 0;
}

#include<bits/stdc++.h> using namespace std; int main() { int x,a,s,d,f; cin>>x; a=x/100; s=x/10%10; d=x%10; x=a100+10s+d1; f=100d+10s+1a; cout<<f<<endl; return 0; }

#include<bits/stdc++.h> 
using namespace std;
int main(){
	int n;
	cin>>n;
	if(n%100%10==0){
	cout<<n/10%10<<n/100;
	}else{
	cout<<n%100%10<<n/10%10<<n/100;	
	}
	return 0;
}