#include <iostream>
#include <algorithm>
#include <string>
#include <fstream>
#include <vector>
#include <cstdio>
#include <cmath>
#include <queue>
#include <stack>
#include <cmath>
#include <cstdlib>
#include <cstring>
#include <string>
#include <set>
#include <map>
#include <list>
#include <bitset>

using namespace std;

int main(){
    long long a, b, c;
    cin >> a >> b >> c;
    if (a == 0){
        if (b == 0){
            if (c == 0)
                cout << -1 << endl;
            else
                cout << 0 << endl;
        }
        else{
            cout << 1 << endl;
            cout << c*1.0/b << endl;
        }
    }
    else{
        
    }
                
    return 0;    
}