import collections
text = open('input.txt', 'r', encoding='utf8')
dictWord = dict()
numbers=dict()
myText = text.readlines()
for lines in myText:
    stroka = lines.split()
for word in range(len(stroka)):
    word = stroka[word]
    countWord = stroka.count(word)
    dictWord[countWord] = word
for val in dictWord:
    maxNumb = val
    maxKey = dictWord[val]
    if val > maxNumb:
        maxNumb = val
    if val== maxNumb and dictWord[val] > maxKey:
        maxNumb=val
print(dictWord[maxNumb])