#Using Python Average Calculator

i=0
c=0
t=0
mess="Enter a number or 'END' to finish data input"
while i != "END":
    try:
        i=input(mess)
        mess="Enter a number or 'END' to finish data input"
        t = t+float(i)
        c += 1
    except ValueError:
        if i=="END":
            break
        else:
            mess="Enter a NUMBER or the word 'END'"

ave=t/c
print("Average %5.2f" %ave)