#include <bits/stdc++.h>
using namespace std;
int main()
{ string s;
int c=0,myvariable;
level:
cout<<"enter any string: ";
cin>>s;
if( (s[0]>='a'&&s[0]<='z')||(s[0]>='A'&&s[0]<='Z')||(s[0]=='_') )
{
for(int i=1;i<s.length();i++)
{
if((s[i]>='a'&& s[i]<='z')||(s[i]>='A' && s[i]<='Z')||(s[i]>='0'&& s[i]<='9')||(s[i]=='_') )
{
c++;
}}
if(c==s.length()){
myvariable=0;
}}else
{myvariable=1;
}
if(myvariable==1)
cout<<s<<"is not valid identifier"<<endl;
else
cout<<s<<" is valid identifier"<<endl;
goto level;
return 0;
}
{"html5":"htmlmixed","css":"css","javascript":"javascript","php":"php","python":"python","ruby":"ruby","lua":"text\/x-lua","bash":"text\/x-sh","go":"go","c":"text\/x-csrc","cpp":"text\/x-c++src","diff":"diff","latex":"stex","sql":"sql","xml":"xml","apl":"apl","asterisk":"asterisk","c_loadrunner":"text\/x-csrc","c_mac":"text\/x-csrc","coffeescript":"text\/x-coffeescript","csharp":"text\/x-csharp","d":"d","ecmascript":"javascript","erlang":"erlang","groovy":"text\/x-groovy","haskell":"text\/x-haskell","haxe":"text\/x-haxe","html4strict":"htmlmixed","java":"text\/x-java","java5":"text\/x-java","jquery":"javascript","mirc":"mirc","mysql":"sql","ocaml":"text\/x-ocaml","pascal":"text\/x-pascal","perl":"perl","perl6":"perl","plsql":"sql","properties":"text\/x-properties","q":"text\/x-q","scala":"scala","scheme":"text\/x-scheme","tcl":"text\/x-tcl","vb":"text\/x-vb","verilog":"text\/x-verilog","yaml":"text\/x-yaml","z80":"text\/x-z80"}
