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Score : $100$ points

### Problem Statement

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.

### Sample Input 1

100 17


### Sample Output 1

83


$17$ out of the initial $100$ grams of sand will be consumed, resulting in $83$ grams.

### Sample Input 2

48 58


### Sample Output 2

0


All $48$ grams of sand will be gone, resulting in $0$ grams.

### Sample Input 3

1000000000 1000000000


### Sample Output 3

0