c - Need to take multiple digit input from a string removing spaces and alphabets -

i writing program taking string input, here need remove spaces , ignore alphabets , use numerals.

i able achieve removing spaces , alphabets, can use single digits , not multiple digits.

example:input string:"adsf 12af 1 a123c 53c2m34n"

here need use input "12 1 123 54234" required application.

it great 1 share logic or sample code same.

thanks in advance

#include <stdio.h> #include <string.h> #include <ctype.h>  int pullout(const char *str, int array[], int *size){     const char *p = str, *endp;     int pull, count = 0, max = *size, num;      do{         endp=strchr(p, ' ');         if(endp == null)             endp=strchr(p, '\0');          for(num=pull=0; p != endp; ++p){             if(isdigit(*p)){                 num = num * 10 + *p - '0';                 pull = 1;             }         }         if(pull && count < max)             array[count++] = num;          while(*p == ' ')             ++p;//skip sapce     }while(*endp != '\0');      return *size = count; }  int main(void){     char input[] = "adsf 12af   1 a123c 53c2m34n abc def";     int i, arr[128] = { 0 }, arr_num = sizeof(arr)/sizeof(int);      pullout(input, arr, &arr_num);      for(i = 0; < arr_num ; ++i)         printf("%d\n", arr[i]);      return 0; }