interleave(1, 2);

    ABB # BAB and BBA are also fine 

##</code><code>##

print interleave(4, 5);
ababbbaba
print interleave(4, 7);
ababbbbbaba

##</code><code>##

print interleave(4, 5);
abbabbaba
print interleave(4, 7);
abbbabbabba