#include <stdio.h>
#include <iostream>
#include <cstdlib>


using namespace std;

int main() {
    
    double k1,k2,l1,l2;
    cin >> k1 >> l1;
    cin >> k2 >> l2;
    
    if ( (k1 - k2) == 0) {
        cout << "Pravci su paralelni!";
    } else {
        double x,y;
        x = (l2 - l1)/(k1 - k2);
        y = k1*x + l1; 
        printf( "Pravci se sijeku u tocki S ( %.4f, %.4f )." , x , y );
    }

    cout << endl;

    // system("pause");
    return 0;
}