Hashmat is a brave warrior who with his group of young soldiers moves from one place to another to fight against his opponents. Before Fighting he just calculates one thing, the difference between his soldier number and the opponent’s soldier number. From this difference he decides whether to fight or not. Hashmat’s soldier number is never greater than his opponent.

For each line of input, print the difference of number of soldiers between Hashmat’s army and his opponent’s army. Each output should be in seperate line. Ends with a newline