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#include <iostream> #include <vector> #include <string> #include <algorithm> using namespace std; int main() { string sa, sb, st; vector<int> v; int i; int a, b, sum; int flag; while (cin>>sa>>sb) { flag = 0; v.clear(); sum = 0; reverse(sa.begin(),sa.end()); reverse(sb.begin(),sb.end()); if (sa.size() < sb.size()) { st = sa; sa = sb; sb = st; } for (i = 0; i < sa.size(); i++) { if(sa[i] == '0') a = 0; else if (sa[i] == '1') a = 1; else if(sa[i] == '2') a = 2; else if(sa[i] == '3') a = 3; else if(sa[i] == '4') a = 4; else if(sa[i] == '5') a = 5; else if(sa[i] == '6') a = 6; else if(sa[i] == '7') a = 7; else if(sa[i] == '8') a = 8; else if(sa[i] == '9') a = 9; else if(sa[i] == 'a') a = 10; else if(sa[i] == 'b') a = 11; else if(sa[i] == 'c') a = 12; else if(sa[i] == 'd') a = 13; else if(sa[i] == 'e') a = 14; else if(sa[i] == 'f') a = 15; else if(sa[i] == 'g') a = 16; else if(sa[i] == 'h') a = 17; else if(sa[i] == 'i') a = 18; else if(sa[i] == 'j') a = 19; if(i >= sb.size()) b = 0; else { if(sb[i] == '0') b = 0; else if (sb[i] == '1') b = 1; else if(sb[i] == '2') b = 2; else if(sb[i] == '3') b = 3; else if(sb[i] == '4') b = 4; else if(sb[i] == '5') b = 5; else if(sb[i] == '6') b = 6; else if(sb[i] == '7') b = 7; else if(sb[i] == '8') b = 8; else if(sb[i] == '9') b = 9; else if(sb[i] == 'b') b = 10; else if(sb[i] == 'b') b = 11; else if(sb[i] == 'c') b = 12; else if(sb[i] == 'd') b = 13; else if(sb[i] == 'e') b = 14; else if(sb[i] == 'f') b = 15; else if(sb[i] == 'g') b = 16; else if(sb[i] == 'h') b = 17; else if(sb[i] == 'i') b = 18; else if(sb[i] == 'j') b = 19; } sum = a + b + flag; if (sum >= 20) { flag = 1; sum = sum - 20; } else flag = 0; v.push_back(sum); } if (flag == 1) v.push_back(1); for (i = v.size()-1; i >= 0; i--) { if(v[i] < 10) cout<<v[i]; else if(v[i] == 10) cout<<"a"; else if(v[i] == 11) cout<<"b"; else if(v[i] == 12) cout<<"c"; else if(v[i] == 13) cout<<"d"; else if(v[i] == 14) cout<<"e"; else if(v[i] == 15) cout<<"f"; else if(v[i] == 16) cout<<"g"; else if(v[i] == 17) cout<<"h"; else if(v[i] == 18) cout<<"i"; else if(v[i] == 19) cout<<"j"; } printf("\n"); } return 0; }