from min_stack import MinStack
from stack import MainStack


def main(input_1, input_2):
    result = []
    stack = MinStack()
    result.append(None)

    for i in range(1, len(input_1)):
        if input_1[i] == "push()":
            push = stack.push(input_2[i])
            result.append(push)
        elif input_1[i] == "pop()":
            pop = stack.pop()
            result.append(pop)
        elif input_1[i] == "min_number()":      
            min_num = stack.min_number()
            result.append(min_num)

    return result