## Answers

#include <iostream> #include <string> using namespace std;.int LetterCount(string word) { string distinct; for (int i = 0; i < word.size(); ++i) { // go through each character of word char ch = word[i]; // get character from word if (ch >= 'A' && ch <= 'Z') // if character is upeprcase ch = ch + 'a' - 'A'; // then convert it to lowercase bool found = false; // set found to false for (int j = 0; j < distinct.size(); ++j) { // go through all charcters of distinct if (ch == distinct[j]) // if this character at word is already in distinct string found = true; // set found to true } if (!found) { // if this character is not found in distinct distinct += ch; // then add it to distinct string } } return distinct.size(); // finally return the length of distinct string }int main() { cout << LetterCount("Hellohowareyou") << endl; return 0; }

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