For a 1 letter shift:
abcdefghijklmnopqrstuvwxyz BCDEFGHIJKLMNOPQRSTUVWXYZA
for two shifts:
abcdefghijklmnopqrstuvwxyz CDEFGHIJKLMNOPQRSTUVWXYZAB
and three shifts:
abcdefghijklmnopqrstuvwxyz DEFGHIJKLMNOPQRSTUVWXYZABC
For a 1 letter shift:
abcdefghijklmnopqrstuvwxyz BCDEFGHIJKLMNOPQRSTUVWXYZA
for two shifts:
abcdefghijklmnopqrstuvwxyz CDEFGHIJKLMNOPQRSTUVWXYZAB
and three shifts:
abcdefghijklmnopqrstuvwxyz DEFGHIJKLMNOPQRSTUVWXYZABC