Sum – Alphabet Separated Values

The program must accept N integers separated by an alphabet as the program must print the sum of those N integers as the output.

Boundary Condition(s):
2 <= N <= 100
1 <= Each integer value <= 10^7

Input Format:
The first line contains N.
The second line contains N integers separated by an alphabet.

Output Format:
The first line contains the sum of N integers.

Example Input/Output 1:
Input:
4
10a5w240n23

Output:
278
Explanation:
The four integers are 10, 5, 240, and 23. So their sum is 278.

Example Input/Output 2:
Input:
5
1s2d3h4e4

Output:
14

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

int main() {
    int n;
    char a[10000000];
    scanf("%dn%s", & n, a);
    int s = 0;
    int f;
    for (int i = 0; i < strlen(a); i++) {
        f = 0;
        while (i < strlen(a) && ((a[i] >= 'a' && a[i] <= 'z') || (a[i] >= 'A' && a[i] <= 'Z'))) {
            i++;
        }
        while (i < strlen(a) && !((a[i] >= 'a' && a[i] <= 'z') || (a[i] >= 'A' && a[i] <= 'Z'))) {
            int l = a[i] - '0';
            f = (f * 10) + l;
            i++;
        }
        s += f;
    }
    printf("%d", s);
    return 0;
}