Every now and then the guys and I at work have a challenge. Our boss will give us 20 or so strings and every string has a unique result. What we have to do is figure out how you get that result. First one to get it correctly gets a free lunch, all the other people have to pay for the winners lunch.... its kinda fun, and usually im pretty good at this stuff, but this time im having a little trouble. Anyone care to give this a shot? im starving with no money

string: aaaaaaaaaaaaaaaaaaa
result: 0

string: bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb
result: 0

string: $$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
result: 0

string: ab
result: 1

string: abcdefg
result: 3

string: 1234567
result: 3

string: 7654321
result: 3

string: !@#$%^&
result: 1

string: abcdefghijklmnopqrstuvwxyz
result: 13

string: abcdefghijklmnopqrstuvwxyz1234567890
result: 0

string: RtRtRtRtRt
result: 5

string: aaaaaaaaaaaaaaaaaaaaab
result: 1

string: 4983740742
result: 10

string: YkjGlD08Dg7435jJDf787jlasffFDK9&fjg
result: 120

string: asdfds()&(SD&Fdskj44984sd98f498345345s84498s4s98x4e98579
result: 982

string: HelloThereHowAreYou?
result: 33