Grades

Input

One single string contains Petya’s grades. It is known that Petya only receives twos and fives. The grades are written consecutively without spaces, and the total number of grades does not exceed $1000$.

Output

Print:

• $5$ if there are more fives than twos;

• $2$ if there are more twos than fives;

• the equality symbol '$=$' if the number of twos and fives is equal.

Examples