The answer for Conditional Statements - Excercise 13 is

var = int(input('Enter the number to which you need to find factorial..'))
st = ''
fac = 1
while var != 0:
st = st + str(var) + 'x'
fac = fac * var
var = var - 1
print('The factorial of %s (%s) is %s'%(var,st[:-1],fac))