TJ WHY

#include<iostream>
using namespace std;
int main(){
	long long a,c,b=1;
	cin>>c;
	if(c<0){
	    c=abs(c);
	    cout<<"-";
	}
	while(c>=10){
		if (c%10!=0){
			b+=1;
		}
		if(!c%10==0 && b!=1){
			cout<<c%10;
		}
        c=c/10;
	}	
	cout<<c;
}