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Given a string str containing alphanumeric characters. The task is to calculate the sum of all the numbers present in the string.

**Example 1:**

**Input:
**str = 1abc23
**Output: **24**
Explanation: **1 and 23 are numbers in the
string which is added to get the sum as
24.

**Example 2:**

**Input:
**str = geeks4geeks
**Output: **4**
Explanation: **4 is the only number, so the
sum is 4.

**Your Task:**

The task is to complete the function **findSum()** which finds and returns the sum of numbers in the string.

**Expected Time Complexity: **O(N)

**Expected Auxiliary Space: **O(N)

**Constraints:**

1 <= length of the string <= 10^{5}

Sum of Numbers <= 10^{5}

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Sum of numbers in string

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