#include <LiquidCrystal.h>

int PIN_RS = 8;
int PIN_EN = 9;
int PIN_DB4 = 4;
int PIN_DB5 = 5;
int PIN_DB6 = 6;
int PIN_DB7 = 7;
int But = 10;

bool buttonWasUp = true;

LiquidCrystal lcd(PIN_RS, PIN_EN, PIN_DB4, PIN_DB5, PIN_DB6, PIN_DB7);
void setup() {
  lcd.begin(16,2);
  pinMode(But, INPUT_PULLUP);
}

void loop() {
  if(digitalRead(But) == LOW){
    delay(10);
  lcd.clear();
  lcd.print("БВГДЕИЙ");
  }
  else{
    delay(10);
  lcd.clear();
  lcd.print("бвгдеий");
  }
}