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@Luzhiled Luzhiled/ABC063-A.cpp
Last active Jun 4, 2017

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#include <bits/stdc++.h>
using namespace std;
int main() {
int a, b;
cin >> a >> b;
if (a + b >= 10) {
cout << "error" << endl;
else {
cout << a + b<< endl;
return 0;
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