Problem:
Score : 200 points

Problem Statement

Snuke has decided to construct a string that starts with A and ends with Z, by taking out a substring of a string s (that is, a consecutive part of s).

Find the greatest length of the string Snuke can construct. Here, the test set guarantees that there always exists a substring of s that starts with A and ends with Z.

Constraints

1 ≦ |s| ≦ 200{,}000

s consists of uppercase English letters.

There exists a substring of s that starts with A and ends with Z.

Input

The input is given from Standard Input in the following format:

s

Output

Print the answer.

Sample Input 1

QWERTYASDFZXCV

Sample Output 1

5

By taking out the seventh through eleventh characters, it is possible to construct ASDFZ, which starts with A and ends with Z.

Sample Input 2

ZABCZ

Sample Output 2

4

Sample Input 3

HASFJGHOGAKZZFEGA

Sample Output 3

12

Solution in Pascal (FPC 2.6.2) (judge verdict: Runtime Error)

var
    i,j,n:longint;
    ch:array[1..200000]of char;
begin
    while not eof do 
        begin
            inc(n);
            read(ch[n]);
        end;
    for i:=1 to n do if ch[i]='A' then break;
    for j:=n downto 1 do if ch[j]='Z' then break;
    writeln(j-i+1);
end.