1 strlen("")=0 2 strlen("a")=1 3 strlen("ab")=2 4 strlen("abc")=3 5 strlen("abcd")=4 6 strlen("abcde")=5 7 strlen("abcdef")=6 8 strlen("abcdefg")=7 9 strlen("abcdefgh")=8 10 strlen("abcdefghi")=9 11 strlen("abcdefghij")=10 12 strlen("abcdefghijk")=11 13 strlen("abcdefghijkl")=12 14 strlen("abcdefghijklm")=13 15 strlen("abcdefghijklmn")=14 16 strlen("abcdefghijklmno")=15 17 strlen("abcdefghijklmnop")=16 18 strlen("abcdefghijklmnopq")=17 19 strlen("abcdefghijklmnopqr")=18 20 strlen("abcdefghijklmnopqrs")=19 21 strlen("abcdefghijklmnopqrst")=20 22 strlen("abcdefghijklmnopqrstu")=21 23 strlen("abcdefghijklmnopqrstuv")=22 24 strlen("abcdefghijklmnopqrstuvw")=23 25 strlen("abcdefghijklmnopqrstuwvx")=24 26 strlen("abcdefghijklmnopqrstuwvxy")=25 27 strlen("abcdefghijklmnopqrstuwvxyz")=26 28 strlen("xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx")=255 29 strlen("xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx")=256 30
