#include <iostream>
#include <cstring>
#include <cstdio>
#include <cstdlib>
#include <locale.h>
#include <math.h>

int difference(int *x, int *y, int *z, int length);

int main()
{
     setlocale(LC_ALL, "rus");
     std::string fNum, sNum;
     std::cout << "Введите первое число: #"; std::getline(std::cin, fNum);
     std::cout << "Введите второе число: #"; std::getline(std::cin, sNum);
     long int fCount = fNum.length(), sCount = sNum.length();
     int *fArray = new int[fCount], *sArray = new int[sCount];
     for(int i = 0; i < fCount; i++){
         char temp = fNum.at(fCount - i - 1);
         fArray[i] = temp - '0';
     }
     for(int i = 0; i < sCount; i++){
         char temp = sNum.at(sCount - i - 1);
         sArray[i] = temp - '0';
     }
     int k = 0;
     int length = fCount;
     if(fCount > sCount){
         length = fCount;
         k = 1;
     }
     else if(sCount > fCount){
         length = sCount;
         k = 2;
     }
     else
         for(int i = 0; i < length;){
             if(fArray[i] > sArray[i]){
                 k = 1;
                 break;
             }
             else if(sArray[i] > fArray[i]){
                 k = 2;
                 break;
             }
         }
     int *dArray = new int[length];
     if(k == 1) difference(fArray, sArray, dArray, length);
     if(k == 2) difference(sArray, fArray, dArray, length);
     return 0;
}

int difference(int *x, int *y, int *z, int length){
     for(int i = 0; i < length; i++){
         if(i < (length - 1)){
             x[i+1]--;
             z[i] += 10 + x[i];
         }
         else z[i] += x[i];

         z[i] -= y[i];

         if((z[i] / 10) > 0){
             z[i+1]++;
             z[i] %= 10;
         }
     }
     for(int i = (length - 1); i >= 0; i--)
         std::cout << z[i];
     std::cout << std::endl;
     return 0;
}