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#include <iostream>
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using namespace std;
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int main(){
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std::string input;
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std::cin >> input;
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long total = 0;
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for(int i = 0; i < input.size(); i++){
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int next_index = (i + 1) % input.size();
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if(input[i] == input[next_index]){
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total += input[i] - '0';
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}
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}
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std::cout << total;
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}
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