N = int(input()) a = N < 0 if a: N = -N b = str(N):-1 b = b.lstrip('0') if not b: c = 0 else: c = int(b) if a: c = -c print(c)

#include <iostream> using namespace std; int main(){ int n; cin>>n; int a=0; while(n!=0){ a=a*10+n%10; n/=10; } cout<<a; return 0; }

AC #include<bits/stdc++.h> #include<bits/stdc++.h> using namespace std; int main(){ int a,b=0,count=0; cin>>a; while(true){ b=a%10; count=count*10+b; a/=10; if(a==0){ break; } } cout<<count; return 0; }