#include <iostream>
using namespace std;

int input_manip(int &num);
void sum_digits(int n);
int smallest_num(int n);
int biggest_num(int n);
void total_digits(int n);

int main() {
    int num, x, z;

    input_manip(num);
    sum_digits(num);
    z = biggest_num(num);
    cout << "The biggest digit is: " << z << endl;
    x = smallest_num(num);
    cout << "The smallest digit is: " << x << endl;
    total_digits(num);
}

int input_manip(int &num){
    cout << "Enter an integer number, please: ";
    cin >> num;

    while(num < 0) {
        cout << "Error! Invalid number! \n";
        cout << "Enter an integer number, please: ";
        cin >> num;
    }
    return num;
}


void sum_digits(int n){
    cout << "Sum of the digits is: ";
    int digit, num1=n, sum=0;
    while(num1 != 0) {
        digit = num1 % 10;
        num1 = num1 / 10;
        sum += digit;
        cout << digit;
        if (num1 != 0) { cout << "+"; }
    }
    cout << " = " << sum << endl;
}

int smallest_num(int n){
    int digit, num1=n, sum;
    sum = num1 % 10;
    while(num1 != 0) {
        digit = num1 % 10;
        num1 = num1 / 10;
        if(digit < sum) { sum = digit; }

    }
    return sum;
}

int biggest_num(int n){
    int digit, num1=n, sum;
    sum = num1 % 10;
    while(num1 != 0) {
        digit = num1 % 10;
        num1 = num1 / 10;
        if(digit > sum) { sum = digit; }

    }
    return sum;
}


void total_digits(int n){
    int num1=n, i=0;
    while(num1 != 0) {
        num1 = num1 / 10;
        i++;
    }
cout << "Number of digits in the number is: " << i << endl;
}