#include <iostream.h>

int main() {
    const int size_a = 6;
    const int size_b = 3;
    int a[size_a] = {1, 2, 3, 1, 4, 5};
    int b[size_b] = {1, 2, 3};

    int c[size_a], size_c = 0;

    for(int i = 0; i < size_a; ++i) {
        int count = 0;
        for(int j = 0; j < size_a; ++j)
            count += (a[i] == a[j]) ? 1 : 0;

        if(count == 1) {
            for(int j = 0; j < size_b; ++j) {
                if(a[i] == b[j]) {
                    c[size_c++] = a[i];
                }
            }
        }
    }

    for(i = 0; i < size_c; ++i)
        cout << c[i] << " ";
    cout << endl;
    return 0;
}