import re

def is_valid_name(name):
    # Name can contain alphabets and spaces only
    return bool(re.match(r'^[A-Za-z ]+$', name))

def main():
    n = int(input().strip())
    tail = []

    for _ in range(n):
        name = input().strip()
        if not is_valid_name(name):
            print("Invalid input.")
            return
        tail.append(name)
    
    # Print all names separated by space (joining the full names)
    print(" ".join(tail))

if __name__ == "__main__":
    main()