input = open("input.txt").read().splitlines()

# line = current line that is being searched
# start = at what index to start searching
    # for the first digit: 0
    # for the second digit: right after the index of the first digit
# is_first_digit = boolean, True if first digit is being found, False if second digit is being found
# num_to_find = (next) number to search for in the string (line), starts at 9 decreases when not found
def find_biggest_num_index(line, start, is_first_digit):
    index = -1
    num_to_find = 9
    while True:
        index = line.find(str(num_to_find), start)
        # decrease num_to_find if number is not found
        # OR we are currently searching for the first digit and the number found is the last char in the string
        if index == -1 or (is_first_digit and index == len(line) - 1):
            num_to_find -= 1
        else:
            return index
answer = 0

for line in input:
    first_digit_index = find_biggest_num_index(line, 0, True)
    second_digit_index = find_biggest_num_index(line, first_digit_index + 1, False)
    answer += int(line[first_digit_index] + line[second_digit_index])

print(answer)