#include <iostream>
using namespace std;
 
int main() {
    int a, b, c, d;
 
    // รับค่าให้ถูกต้องตามเงื่อนไข
    while (true) {
        cout << "Enter number 1: ";
        cin >> a;
        cout << "Enter number 2: ";
        cin >> b;
        cout << "Enter number 3: ";
        cin >> c;
        cout << "Enter number 4: ";
        cin >> d;
 
        if (a >= 1 && a <= 100 &&
            b >= 1 && b <= 100 &&
            c >= 1 && c <= 100 &&
            d >= 1 && d <= 100 &&
            a == c && b == d) {
            break;
        }
 
        cout << "Invalid input, please try again.\n\n";
    }
 
    cout << "\nInput: " << a << ", " << b << ", " << c << ", " << d << endl;
 
    // เดินเป็นสี่เหลี่ยม
    cout << "Start: Walk straight ";
    if (a == 1)
        cout << "down ";
    else
        cout << "up ";
    cout << a << " unit and turn left." << endl;
 
    cout << "Walk straight for " << b << " units and turn left." << endl;
 
    cout << "Walk straight ";
    if (c == 1)
        cout << "up ";
    else
        cout << "down ";
    cout << c << " unit and turn left." << endl;
 
    cout << "End: Walk straight for " << d << " units." << endl;
 
    // วาดกรอบ
    cout << "+++++++++++++++++++++++++\n";
    cout << "Rectangular area = " << b << " * " << a
         << " = " << b * a << " unit\n";
    cout << "+++++++++++++++++++++++++\n";
 
    return 0;
}

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