#include <stdio.h>
 
 
int count_digits(const char *str) {
    int count = 0;
    while (*str) {
        if (*str >= '0' && *str <= '9') {
            count++;
        }
        str++;
    }
    return count;
}
 
int main() {
    char input[100];
 
    printf("文字列を入力してください: ");
    fgets(input, sizeof(input), stdin);
 
    int digits = count_digits(input);
 
    printf("数字の文字数: %d\n", digits);
 
    return 0;
}
 

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