ABCPATH  ABC Path
You will be given a 2dimensional grid of letters. Find the length of the longest path of consecutive letters, starting at 'A'. Paths can step from one letter in the grid to any adjacent letter (horizontally, vertically, or diagonally).
For example, in the following grid, there are several paths from 'A' to 'D', but none from 'A' to 'E':
One such path is:
Input
Each test case will start with a line contains two integers H, W the height and width of the grid respectively 1 <= H, W <= 50. Then H lines follow each of W uppercase letters only. Input terminates with H = 0 and W = 0.
Output
For each test case print “Case C: X” without quotes where C is the case number starting with 1 and X is the solution.
Example
Sample Input: 4 3 ABE CFG BDH ABC 0 0 Sample Output: Case 1: 4
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Ayon Das:
20150512 14:43:39
Consider the tst cases


GAURAV CHANDEL:
20150407 15:52:04
Good problem.Using dfs .... Graph is happiness... Last edit: 20150407 15:52:21 

Anubhav Gupta:
20150319 20:12:25
My 200th :D 

Rajat (1307086):
20150218 23:34:17
how wasi added an image.....anyone please tell.


vedsar:
20150208 07:41:57
is there any space between any two lines?


Ankit Sultana:
20150102 18:44:23
Sometimes the difference between TLE and AC is just an ampersand 

ওয়াসী (Wasi):
20140116 11:03:37
@Hasil Sharma initial image


Hasil Sharma:
20140116 08:57:50
Initial image is missing ... Can anyone please provide the link ? 

Ouditchya Sinha:
20130608 11:20:08
Nice problem. :) 

god_father:
20130126 09:47:13
nice question...be carefull about visited paths it caused me 2 TLE; 
Added by:  Ali Arous 
Date:  20111105 
Time limit:  1s 
Source limit:  50000B 
Memory limit:  1536MB 
Cluster:  Cube (Intel G860) 
Languages:  All except: ASM64 
Resource:  FCIS Local Contest 2012 