#include <stdio.h>
 
int isdigit(char c) {
    return c >= '0' && c <= '9';
}
 
int count_digits(const char *str) {
    int count = 0;
    for (int i = 0; str[i] != '\0'; i++) {
        if (isdigit(str[i])) {
            count++;
        }
    }
    return count;
}
 
int main() {
    char input[1000];
 
    printf("文字列を入力してください: ");
    fgets(input, sizeof(input), stdin);
 
    input[strcspn(input, "\n")] = '\0';
 
    int digits = count_digits(input);
 
    printf("数字文字の個数: %d\n", digits);
 
    return 0;
}

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