# Complete the funtion below
# Given a string, print a pyramid by printing all the substrings from index 0. 
# If input string is None or empty then print an '*'
# All the letters should be printed uppercase
# Example, for s = 'Saturn'
# Output:
# S
# SA
# SAT
# SATU
# SATUR
# SATURN

def print_pyramid(s):
    return

if __name__ == '__main__':
    print_pyramid('')
    print_pyramid('Saturn')
