C :

#include<stdio.h>

int main()
{
	printf("A\n");
	printf("BC\n");
	printf("DEF\n");
	printf("GHIJ\n");
	printf("KLMNO\n");
	printf("PQRSTU\n");
	printf("V\n");
	printf("W\n");
	printf("X\n");
	printf("Y\n");
	printf("Z\n");
	return 0;
}

C++ :

#include<stdio.h>

int main()
{
	printf("A\n");
	printf("BC\n");
	printf("DEF\n");
	printf("GHIJ\n");
	printf("KLMNO\n");
	printf("PQRSTU\n");
	printf("V\n");
	printf("W\n");
	printf("X\n");
	printf("Y\n");
	printf("Z\n");
	return 0;
}

Pascal :

begin
  writeln('A');
  writeln('BC');
  writeln('DEF');
  writeln('GHIJ');
  writeln('KLMNO');
  writeln('PQRSTU');
  writeln('V');
  writeln('W');
  writeln('X');
  writeln('Y');
  writeln('Z');
end.