number_of_names = int(raw_input())
names = []
for n in range(number_of_names):
name = raw_input()
names.append(name)
print max(names, key = len)
bnVtYmVyX29mX25hbWVzID0gaW50KHJhd19pbnB1dCgpKQpuYW1lcyA9IFtdCmZvciBuIGluIHJhbmdlKG51bWJlcl9vZl9uYW1lcyk6CiAgICBuYW1lID0gcmF3X2lucHV0KCkKICAgIG5hbWVzLmFwcGVuZChuYW1lKQpwcmludCBtYXgobmFtZXMsIGtleSA9IGxlbik=