X Strings: Input a string. Output the starting position and length of the first occurrence of the longest substring of capital Xs in that string. The first letter is in position 1.
For example:
? XabXXXXXxxxXXXXXyyXX
position=4 length=5
?XXabcXXXXyyXXXXcccXeeeXXX
postion=5 lenght=4
?xxxabcDcdggc
No Xs
If there are no Xs in the input string, print "no Xs".