#include<bits/stdc++.h> using namespace std; int main() { int a[256],b[256],c[256],lena,lenb,lenc,i; char n[256],n1[256],n2[256]; memset(a,0,sizeof(a)); memset(b,0,sizeof(b)); memset(c,0,sizeof(c)); cin>>n1>>n2; if(strlen(n1)<strlen(n2)||(strlen(n1)==strlen(n2)&&strcmp(n1,n2)<0)) { strcpy(n,n1); strcpy(n1,n2); strcpy(n2,n); cout<<"-"; } lena=strlen(n1);lenb=strlen(n2); for(i=0;i<=lena-1;i++)a[lena-i]=int(n1[i]-'0'); for(i=0;i<=lenb-1;i++)b[lenb-i]=int(n2[i]-'0'); i=1; while(i<=lena||i<=lenb) { if(a[i]<b[i]) { a[i]+=10; a[i+1]--; } c[i]=a[i]-b[i]; i++; } lenc=i; while((c[lenc]==0)&&(lenc>1))lenc--; for(i=lenc;i>=1;i--)cout<<c[i] cout<<endl; return 0; }