import sys


def find_indexes(word):
    indexes = []
    for index, w in enumerate(word):
        char = ord(w)
        if 48 <= int(char) <= 57:
            indexes.append(index)
    return indexes


def find_max_substring(indexes, word):
    substring = []
    max_substring = []
    substring.append(word[indexes[0]])

    for i in range(1, len(indexes), 1):
        prev = indexes[i-1]
        curr = indexes[i]

        if prev+1 == curr:
            substring.append(word[curr])
        else:
            if len(max_substring) < len(substring):
                max_substring = substring.copy()
            substring.clear()
            substring.append(word[curr])
    if len(substring) > len(max_substring):
        return substring
    else:
        return max_substring


def max_line_digits(line):
    output = ""
    substrings = line.split(' ')
    for sub in substrings:
        indexes = find_indexes(sub)
        if indexes:
            digits = "".join(find_max_substring(indexes, sub))
            output += digits + " "

    if output == '':
        return False
    else:
        return output.rstrip()

lines = ['34234 34 dfd gfd 5', '34535','fsdflskfjsdflk', 'fsdkfj sdf34fdfd']

for line in sys.stdin:
    if max_line_digits(line):
        print(max_line_digits(line))