#stars.py
#triangles of stars
#User enters a number, output lines of one, two, ... that number of asterisks

rows = eval(input("Enter size of triangle of stars: "))

for row in range(1,rows+1):       #each row
    for col in range(1,row+1):       #each column (i.e. star) on this row
        print("*", end="")            #suppress the newline
    print()                       #newline for this line of output

#"reversed" lines. Need to output some spaces before the stars
print()
for row in range(1,rows+1):       #each row
    for col in range(1,rows+1):       #each column on this row is either space or *
        if col <= rows-row:
            print(" ", end="")            #space
        else:
            print("*", end="")            # *
    print()                       #newline for this line of output