Answer to life, the universe, and everything Task
Given a String as input, your task is to output 42 only if the input String happens to be exactly the following :
abbcccddddeeeeeffffffggggggghhhhhhhhiiiiiiiiijjjjjjjjjjkkkkkkkkkkkllllllllllllmmmmmmmmmmmmmnnnnnnnnnnnnnnoooooooooooooooppppppppppppppppqqqqqqqqqqqqqqqqqrrrrrrrrrrrrrrrrrrsssssssssssssssssssttttttttttttttttttttuuuuuuuuuuuuuuuuuuuuuvvvvvvvvvvvvvvvvvvvvvvwwwwwwwwwwwwwwwwwwwwwwwxxxxxxxxxxxxxxxxxxxxxxxxyyyyyyyyyyyyyyyyyyyyyyyyyzzzzzzzzzzzzzzzzzzzzzzzzzz

It may output any other value, produce an error or not output at all, if the input does not equal the aforementioned String.

Winning Criterion
This is code-golf, so the shortest code in bytes wins!
Golfscript, 20

26,{.97+\{.}*}%=42`*


with new line, 21 chars (by Nabb)

26,{).[96+]*}%n+=42`*


Actually Nabb beat mine, here is original solution for with new line, 22 chars

26,{.97+\{.}*}%n+=42`*


This is simply generating source string and just comparing it against string from stdin.