#include <iostream>
#include <math.h>
using namespace std;
const int MAX_SIZE = 100;
int operationPlus(int a, int b)
{
    return a + b;
}
int operationMinus(int a, int b)
{
    return a - b;
}
int operationMulti(int a, int b)
{
    return a * b;
}
int operationDivie(int a, int b)
{
    return a / b;
}
int parseToNum(char firstWord[], int i)
{
    int num;
    if (firstWord[i] == '\0')
    {
        return num;
    }
    else
    {
        (int(firstWord[i]) - 48)* pow(10, i);
        parseToNum(firstWord, i + 1);
    }
}
void getFirstNum(char str[], char firstWord[], int i)
{
    if (str[i] <= '0' || str[i] >= '9')
        return;
    else {
        firstWord[i] = str[i];
        getFirstNum(str, firstWord, i + 1);
    }

}
void getSecondNum(char str[], char secondWord[], int i)
{
    if (str[i] <= '0' || str[i] >= '9')
        return;
    else {
        secondWord[i] = str[i];
        getFirstNum(str, secondWord, i + 1);
    }
}
int sumOfStr(char str[], int length, char firstWord[], int i)
{
    static int sum = 0;
    static int firstNum;
    static int secondNum;
    if (i == length + 1)
    {
        return sum;
    }
    if (str[i] == '+')
    {
        sum = operationPlus(firstNum, secondNum);
    }
    else if (str[i] <= '0' || str[i] >= '9')
    {
        sumOfStr(str, length,firstWord, i + 1);

    }
    else
    {
        getFirstNum(str, firstWord, 0);

        parseToNum(firstWord, 0);     //firstNum or secondNum = parse;

    }
}
int lengthOfStr(char str[], int i)
{
    static int counter = 0;
    if (str[i] == '\0')
        return counter;
    else
    {
        counter++;
        lengthOfStr(str, i + 1);
    }

}

int main()
{
    char str[MAX_SIZE];
    char firstWord[10];
        char secondWord[10];
    cin.getline(str, MAX_SIZE);
    int length = lengthOfStr(str, 0);

}