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#include <algorithm>
#include <fstream>
#include <iostream>
#include <string>
using namespace std;
int
main()
{
string digits{ "0123456789" };
fstream input{ "data/01a.txt" };
int sum = 0;
for ( string line; input >> line; ) {
auto first = find_first_of(begin(line), end(line), begin(digits), end(digits));
auto last = find_first_of(rbegin(line), rend(line), begin(digits), end(digits));
auto value = (*first - '0') * 10 + (*last - '0');
sum += value;
}
cout << sum << endl;
}
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