char   key='\0';
#include <Keypad.h>

char keys[4][4] = {
  { '1', '2', '3', 'A' },
  { '4', '5', '6', 'B' },
  { '7', '8', '9', 'C' },
  { '*', '0', '#', 'D' }
                  };

byte C[4] = { 5, 4, 3, 2 };   // Pins C1, C2, C3, C4
byte R[4] = { 9, 8, 7, 6 };   // Pins R1, R2, R3, R4

Keypad keypad = Keypad(makeKeymap(keys), R, C, 4, 4);

void setup() {
  Serial.begin(9600);
}

String s="";
void loop() {
  char key = keypad.getKey();
  String k1 = String(key);
   //if (key != NO_KEY) Serial.println(key);
   s=s+k1;
   if (s == "11*444") Serial.println("yes");
   Serial.println(s); delay(100);
}