# code which is fine
a = "abcdefghijklmnopqrstuvwxyz"
a = "BCDEFGHIJKLMNOPQRSTUVWXYZ"

# code which has issues
a = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
a = "fooABCDEFGHIJKLMNOPQRSTUVWXYZbar"
