def login():
file=open("user.txt","r")
user=input("enter usename")
password=input("enter password")
Check=False
for line in file:
    correct=line.split(":")
    if user==correct[0] and password==correct[1]:
        Check=True
        break
if Check==True:
    print("succesffuly logged in")
    file.close()
    mainMenu()
else:
    print("incorrect log in")
    file.close()
    login()