string pangrams(string s) {
    vector<bool> isTrue(26);
    
    for(char chr : s){
        chr = tolower(chr);
        if(static_cast<int>(chr)>=97 && static_cast<int>(chr)<=122 )
            isTrue[static_cast<int>(chr)-97]=true; 
     }
    bool allTrue = all_of(isTrue.begin(), isTrue.end(), [](bool n){return n;});
    if(allTrue)
        return "pangram";
    else
        return "not pangram";
}