the_code = input()

number_list = [x for x in the_code if x.isdigit()]
digit_list = list(map(int, number_list))
letter_list = [x for x in the_code if not x.isdigit()]


take_list = []
skip_list = []
for y in range(len(digit_list)):
    if y % 2 == 0:
        take_list.append(digit_list[y])
    else:
        skip_list.append(digit_list[y])


result = []

take_index = 0
skip_index = 0

while len(letter_list) > 0:
    if take_index >= len(take_list):
        break

    if skip_index >= len(take_list):
        break

    for i in range(1, take_list[take_index] + 1):
        if len(letter_list) == 0:
            break
        result.append(letter_list[0])
        letter_list.pop(0)
    take_index += 1

    for j in range(1, skip_list[skip_index] + 1):
        if len(letter_list) == 0:
            break
        letter_list.pop(0)
    skip_index += 1

print("".join(result))