s = input().split()
d = {}
for i in s:
    if i in d:
        d[i] += 1

    else:
        d[i] =1
maxx= 0
s1 = ''
for key, value in sorted(d.items()):
    if value > maxx:
        maxx = value

for key, value in sorted(d.items()):
    if value != maxx:
        d.pop(key)
for key, value in sorted(d.items(), reverse = True):
    s1 = key

print(key)