#include <stdio.h>

#include <string.h>

int main() {

 // Declare a character array to store the user's input

 char number[5];

 // Ask the user to enter a four-digit number

 printf("Enter a four-digit number: ");

 scanf("%s", number);

 // Initialize a counter for the number of digits equal to 3

 int count = 0;

 // Iterate over the digits of the number

 for (int i = 0; i < strlen(number); i++) {

   // If the current digit is equal to 3, increment the counter

   if (number[i] == '3') {

     count++;

   }

 }

 // Print the result

 printf("Number of digits equal to 3: %d\n", count);

 return 0;

}