This is a simple code for take any type of a input and count the numbers of it using C

countNumbers.c

// first make sure add there libraries correctly
#include <stdio.h>
#include <string.h>
#include <math.h>
#include <stdlib.h>
#include <ctype.h>

int main() {
    char mem[1000];
    int numCount[10];
    scanf("%[^\n]", mem);
    
    // to initialize numCount array to 0
    for(int i = 0; i < 10; i++)
    {
        numCount[i] = 0;
    }
    
  // counting letters
    for(int i = 0; mem[i] != '\0'; i++)
    {
        if(isdigit(mem[i]))
        {
            int t = (int)mem[i] - 48;
            numCount[t] = numCount[t] + 1;
        }
    }
    
  // print the counted result
    for(int i = 0; i < 10; i++)
    {
        printf("%d ", numCount[i]);
    }
    
    return 0;
}