#include <iostream>
#include <list>

int main() {
    std::list<int> numbers = {1, 2, 3, 4, 5};
    std::cout << "قبل از pop_back: ";
    for (int num : numbers) std::cout << num << " ";
    
    numbers.pop_back(); // حذف آخرین عنصر (5)
    
    std::cout << "\nبعد از pop_back: ";
    for (int num : numbers) std::cout << num << " ";
    
    return 0;
}