Counter Class

Create a Counter class that keeps track of an integer value. It should support three operations:

• increment(): adds 1 to the value
• decrement(): subtracts 1 from the value
• getValue(): returns the current value

The counter starts at 0. Read commands from stdin (one per line): inc, dec, or get. For each get command, print the current value on a new line.

Input

• Line 1: an integer N, the number of commands (0 <= N <= 2·10^4)
• Next N lines: a command (inc, dec, or get)

Output

• For each get command, print the current counter value on a separate line.

Examples

Input:
5
inc
inc
get
dec
get

Output:
2
1

Input:
4
dec
dec
dec
get

Output:
-3

Input:
1
get

Output:
0

Calling get before any inc/dec returns the starting value, 0.

Input:
5
inc
dec
inc
dec
get

Output:
0

Increments and decrements cancel out: the counter returns to 0.