#include <iostream>
#include <math.h>

using namespace std;

void func1(double a, double b, double c);
void func2(double a, double b, double c, double d);
void func3(char c, double x);
void func4(double x1, double y1, double x2, double y2);

void func1(double a, double b, double c){
    if (b >= c && b <= a){
        a *= 2;
        b *= 2;
        c *= 2;
    }
    else{
        a = fabs(a);
        b = fabs(b);
        c = fabs(c);
    }

}

void func2(double a, double b, double c, double d){
    double t;
    if (a>b){
        t = a;
        a = b;
        b = t;
    }
    if (c>d){
        t = c;
        c = d;
        d = t;
    }
    if (a<c && b<d)
        cout << "YES" << endl;
    else
        cout << "NO" << endl;

}

void func3(char c, double x){
    switch (c){
    case 'k':
        cout << "S=" << x*x / 2 << endl << "g=" << sqrt(x*x + x*x) << endl;
        break;
    case 'g':
        cout << "S=" << x*x / 4 << endl << "k=" << sqrt(x*x / 2) << endl;
        break;
    case 's':
        cout << "k=" << sqrt(2 * x) << endl << "g=" << sqrt(2 * x*x) << endl;
        break;
    default:
        break;
    }
}

void func4(double x1, double y1, double x2, double y2){
    if (sqrt(x1*x1 + y1*y1)<sqrt(x2*x2 + y2*y2))
        cout << 'A' << endl;
    else
        cout << 'B' << endl;
}

int main(){
    double a, b, c, d;
    char s;

    cout << "1)Vvedite a, b, c:" << endl;
    cin >> a >> b >> c;
    func1(a, b, c);
    cout << a << ' ' << b << ' ' << c << endl;

    cout << "2)Vvedite a, b, c, d:" << endl;
    cin >> a >> b >> c >> d;
    func2(a, b, c, d);

    cout << "3)Vyberete: k - katet, g - gipotenuza s - ploschad'" << endl << "Vvedite velichinu x:" << endl;
    cin >> s >> a;
    func3(s, a);

    cout << "4)Vvedite x1, y1, x2, y2:" << endl;
    cin >> a >> b >> c >> d;
    func4(a, b, c, d);
}