App doesn't accept CIN and state random numbers

I just started learning the basics of c++ and currently ive got a task from my learning app. The Code should be really simple I don't know what could be wrong. If I start the app, I can't enter data and the app shows some completely random numbers, it should calculate the numbers. Pls help.

#include <iostream>
using namespace std;

int main() {
    int a,b,c ;
    int sum;
    cout << "enter first number \n";
    cin >> a;
    cout << "enter second number \n";
    cin >> b;
    cout << "enter third number \n";
    cin >> c;
    sum = a-b-c;
    cout << "there are  " << sum << "seats";
  
    return 0;
}

Edit: the Compiler says "Split multiple Inputs into separate lines" and nothing else