Problem 3

#include <bits/stdc++.h>

using namespace std;
typedef long long ll;

int main()
{
    #ifndef ONLINE_JUDGE
        freopen("input.txt", "r", stdin);
        freopen("output.txt", "w", stdout);
    #endif

    char ch;
    cin >> ch;
    if((int)ch>=48 && (int)ch<=57)
        printf("%c is a digit\n",ch);
    else if(((int)ch>=65 && (int)ch<=90)||((int)ch>=97 && (int)ch<=122))
    {
        if(ch=='A' || ch=='a' ||ch=='E' || ch=='e' ||ch=='I' || ch=='i' ||ch=='O' || ch=='o' ||ch=='U' || ch=='u')
            printf("%c is an alphabet: it is an vowel\n",ch);
        else
            printf("%c is an alphabet\n",ch);
    }
    else
        printf("%c is a special character\n",ch);

    return 0;
}