#include <stdio.h>
#include <stdlib.h>
#include <string.h>
main()
{
      int borrow,a[100]={0},b[100]={0},c[100],i,len,len1,len2,flag;
      char s1[100],s2[100];
      scanf("%s %s",s1,s2);
      len1=strlen(s1);
      len2=strlen(s2);
      if(len1<len2)
        flag=1;
      else if(len1==len2)
             for(i=0;i<len1;i++)
                if(s1[i]<s2[i])
                {
                   flag=-1;
                   break;
                }
      if(flag>0)
      {
         for(i=0;i<len1;i++)
            a[i]=s1[len1-1-i]-'0';
         for(i=0;i<len2;i++)
            b[i]=s2[len2-1-i]-'0';
      }
      else
      {
          for(i=0;i<len1;i++)
            b[i]=s1[len1-1-i]-'0';
         for(i=0;i<len2;i++)
            a[i]=s2[len2-1-i]-'0';
      }
      len=len1>len2?len1:len2;
      borrow=0;
      for(i=0;i<len;i++)
      {
        c[i]=a[i]-b[i]-borrow;
        borrow=c[i]<0;
        if(borrow>0)
           c[i]+=10;
              /*if(c[i]<0)
        {
          c[i]+=10;
          borrow=1;
        }
        else
          borrow=0;   */
      }
      while(c[len-1]==0&&len>1)
        len--;
      if(flag<0)
        putchar('-');
      for(i=len-1;i>=0;i--)
        printf("%d",c[i]);
      getch();
}

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