IN: (9:abcdefabc) (12:xyzabcabc@@@)
'@' ( 64) x    -3
'd' (100) x     1
'e' (101) x     1
'f' (102) x     1
'x' (120) x    -1
'y' (121) x    -1
'z' (122) x    -1
OUT: 9