//De: nhap vao 2 chuoi bang so. Hay tinh tong hieu 2 chuoi do....
#include<stdio.h>
#include<conio.h>
#include<string.h>
#include<math.h>
#define SIZE 100

void nhap(char S1[SIZE], char S2[SIZE]);
void chuyen(char S1[SIZE], char S2[SIZE], int A[SIZE], int B[SIZE]);
void tinhTong(char S1[SIZE], char S2[SIZE], int A[SIZE], int B[SIZE]);

void main()
{
   char S1[SIZE], S2[SIZE];
   int A[SIZE], B[SIZE];
   nhap(S1, S2);
   chuyen(S1, S2, A, B);
   tinhTong(S1, S2, A, B); //tinh tong kem xuat gia tri neu tinh ra
}
void nhap(char S1[SIZE], char S2[SIZE])
{
   gets(S1);
   gets(S2);
}
void chuyen(char S1[SIZE], char S2[SIZE], int A[SIZE], int B[SIZE])//Chuyen chuoi sang mang
{
   int len1=strlen(S1);
   int len2=strlen(S2);
   for(int i=0; i<len1; i++)
      A[i]=S1[i]-48;
   for(int j=0; j<len2; j++)
      B[j]=S2[j]-48;
}

void tinhTong(char S1[SIZE], char S2[SIZE], int A[SIZE], int B[SIZE])
{
   int len1=strlen(S1);
   int len2=strlen(S2);
   double Tong1;
   double Tong2;
   double Tong;
   for(int i=0; i<len1; i++)
   {
      int j=i+1;
      Tong1 = Tong1 + A[i]* pow(10, (len1-j));
   }
   for(i=0; i<len2; i++)
   {
      int j=i+1;
      Tong2=Tong2 + B[i]* pow(10, (len2-j));
   }
   Tong=Tong1+Tong2;
   printf("%d", Tong);
}