50-50 Rule

Schools of Chefland use the 50−50

50−50 rule to grade their students. As per the rule , students are awarded :

• Z grade, if their attendance is strictly less than 50%
• F grade, if they score strictly less than 50% given that their attendance is greater than or equal to 50%
• A grade, otherwise.

You are given two integers, X andY, denoting the percentage of attendance and percentage of marks obtained by Alice. What grade will Alice get?

Input Format

• The first line of input will contain a single integer T, denoting the number of test cases.
• Each test case consists of two space-separated integers X and Y — the percentage of attendance and percentage of marks obtained by Alice.

Output Format

For each test case, output on a new line, the grade awarded to Alice.

Note that you may print the grade in lowercase or uppercase.