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| #include<iostream> #include<vector>
using namespace std;
bool cmp(vector<int>& A,vector<int>& B){ if(A.size()!=B.size()) return A.size()>B.size(); for(int i=A.size()-1;i>=0;i--){ if(A[i]!=B[i]) return A[i]>B[i]; } return true; } vector<int> sub(vector<int>& A,vector<int>& B){ vector<int> C; for(int i=0,t=0;i<A.size();i++){ t=A[i]-t; if(i<B.size()) t-=B[i]; C.push_back((t+10)%10); if(t<0) t=1; else t=0; } while(C.size()>1&&C.back()==0) C.pop_back(); return C; } int main(){ vector<int> A,B; string a,b; cin>>a>>b; for(int i=a.size()-1;i>=0;i--) A.push_back(a[i]-'0'); for(int i=b.size()-1;i>=0;i--) B.push_back(b[i]-'0'); vector<int> C; if(cmp(A,B)){ C=sub(A,B); }else{ C=sub(B,A); cout<<"-"; } for(int i=C.size()-1;i>=0;i--) cout<<C[i]; cout<<endl; return 0; }
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