大家看一下有错吗

a = input()

1 = "Monday"
2 = "Tuesday"
3 = "Wednesday"
4 = "Thursday"
5 = "Friday"
6 = "Saturday"
7 = "Sunday"
if a1:
print("Monday")
if a2:
print("Tuesday")
if a3:
print("Wednesday")
if a4:
print("Thursday")
if a5:
print("Friday")
if a6:
print("Saturday")
if a==7:
print("Sunday")