# Arup Guha
# 2/17/2012
# Solution to COP 3223H Exam 1 Question #8

NUMNAMES = 10

def main():

    names = []

    for i in range(NUMNAMES):
        name = input("")
        if not (name in names):
            names.append(name)

    names.sort()
    for i in range(len(names)):
        print(names[i])

main()