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#include <iostream>#include <cctype>using namespace std;struct digits{	unsigned freq;	char letter;};int main(){	digits digit[26];	for (int i = 0; i < 26; i++)	{		digit[i].letter = ('a' + i);		digit[i].freq = 0;	}	char ch = 0;	while (ch != '.')	{		cin.get(ch);		// I intialized digit[] in alphabetical order		// this means that I can directly index		if(isalpha(ch)) {			ch = tolower(ch);			digit[ch - 'a'].freq++;		}	}	for (int i = 0; i < 25; i++)	{		int max = i;		for (int j = i; j < 26; j++)		{			if (digit[j].freq > digit[max].freq)			{				max = j;			}		}		digits tmp = digit[i];		digit[i] = digit[max];		digit[max] = tmp;	}		for (int i = 0; i < 26; i++)	{		if(digit[i].freq) {			cout << "	 " << digit[i].letter << "	  " << digit[i].freq << endl;		}	}		}