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using static System.Console;
 
public class Program {
	public static void Main() {
		WriteLine(eNumero(""));
		WriteLine(eNumero("a"));
		WriteLine(eNumero("5"));
	}
	public static bool eNumero(string s) {
		if (string.IsNullOrWhiteSpace(s)) return false;
		return (int)s[0] >= (int)'0' && (int)s[0] <= (int)'9';
	}
}
 
//https://pt.stackoverflow.com/q/385165/101

prog.c:1:7: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘static’
 using static System.Console;
       ^~~~~~
prog.c:3:1: error: unknown type name ‘public’
 public class Program {
 ^~~~~~
prog.c:3:14: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘Program’
 public class Program {
              ^~~~~~~

Standard output is empty