C++ :

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

Java :

import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Scanner sc = new Scanner(System.in);
		int a = sc.nextInt();
		if(a > 0){
			System.out.println("+");
		}else if(a < 0){
			System.out.println("-");
		}
		sc.close();
	}

}

Python :

a=int(input())
if(a<0):
    print("-")
else:
    print("+")