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#include<iostream>
#include<cmath>
#include<algorithm>
#include<string>
using namespace std;
int main()
{
string s;
getline(cin, s);
int arr[26] = { 0 }, Max = 0, index = 0;
for (int i = 0;i < s.length();i++) {
if (s[i] >= 'a' && s[i] <= 'z') {
s[i] = s[i] - 32;
}
arr[int(s[i] - 65)]++;
}
for (int i = 0;i < 26;i++) {
if (arr[i] > Max) {
Max = arr[i];
index = i;
}
}
cout << char(97 + index) ...
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