#include <iostream>
#include <string>
#include <cctype>
#include <map>
 
using namespace std;
 
void count_occurances(const string& the_line)
{
    map<char, unsigned> counts;
 
    for(char c: the_line)
        if(isalpha(c))
            ++counts[toupper(c)];
 
    for(const auto& p: counts)
        cout << char(tolower(p.first)) << " or " << p.first << " occurred: "
             << p.second << " times\n";
}
 
int main()
{
    cout << "Enter line\n"
            ">>";
    string line;
    getline(cin, line);
 
    count_occurances(line);
}
 

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

VGhpcyBpcyBhbiBleGFtcGxl

This is an example