text = input().split()
d = dict()  #skolko raz vstretili
for word in text:
    if word not in d:
        d[word] = 1
    else:
        d[word] += 1
max_c = -1
for key in d:
    if d[key] > max_c:
        max_c = d[key]
        max_w = key
    elif d[key] == max_c:
        if key < max_w:
            max_w = key
print(max_w)