def main():
    while(1):
        size = getPosInt()
        if (size == "0"):
            break
        else:
            if (size == ""):
                print("Missing input!")
            elif (size == "True" or size == "False") :
                print(size + " is not an integer!")
            else:
                 try:
                    val = int(size)
                    if(val < 0):
                       print(size + " is not a positive integer!")
                    else:
                       drawTriangle(val)
                 except ValueError:
                    try:
                        val = float(size)
                        print(size + " is not an integer!")
                    except ValueError:
                        print("Invalid input!")

        break

def drawTriangle(size):
    y = int(size)
    while y > 0:
        for x in range(y):
            print ("*"),
        y-=1
        print

def getPosInt():
    size  = raw_input("Enter the size of  triangle (0 to end): ")
    return size

main()


print ("Programmed by  ")
print ("Date:  ")
print ("End of processing  ")