What will be the output of the following C++ code?

#include <iostream>
using namespace std;
int main ()
{
    int a, b;         
    a = 10;           
    b = 4;            
    a = b;           
    b = 7;           
    cout << "a:";
    cout << a;
    cout << " b:";
    cout << b;
    return 0;
}