input_ls = list(input())
words_len = [0, input_ls.index(" ") + 1]

for i in range(input_ls.index(" ") + 1, len(input_ls)):
    if input_ls[i] == " ":
        words_len.append(i)

words_len.append(len(input_ls) - 1)
words = []

for i in range(1, len(words_len)):
    if words_len[i] == len(input_ls) - 1:
        word = input_ls[words_len[i - 1]: len(input_ls)]
    else:
        word = input_ls[words_len[i - 1]: words_len[i]]
    while " " in word:
        word.remove(" ")

    if word:
        word_str = ""
        for letter in word:
            word_str += letter
        words.append(word_str)


print(max(words, key=len))