p03609 AtCoder Beginner Contest 072 - Sandglass2
We have a sandglass that runs for X seconds. The sand drops from the upper bulb at a rate of 1 gram per second. That is, the upper bulb initially contains X grams of sand.

How many grams of sand will the upper bulb contains after t seconds?

Constraints

* 1≤X≤10^9
* 1≤t≤10^9
* X and t are integers.

Input

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


X t


Output

Print the number of sand in the upper bulb after t second.

Examples

Input

100 17


Output

83


Input

48 58


Output

0


Input

1000000000 1000000000


Output

0
```python
X,t = map(int, input().split())

print(X - t if X > t else 0)
```