ΘΕΜΑ: Που κανω λαθος παρακαλω???

a=10
while a!=1:
print("this is",a)
b=input("enter a number")
a=(a-b)
print("bye")

a = 10
while a > 1:
    print("this is {0} ;)".format(a))
    b = int(input("Enter a number: "))
    a = a - b
print("Χαιρετώ σας!!!")