BEGIN{	
	line=1;
	while(getline x < A){
		file1[line]=x;
		line++;
	}
	close(A);
	line=1;
	while(getline x < B){
		file2[line]=x;
		line++;
	}
	close(B);
	line=1;
	while(getline x < C){
		file3[line]=x;
		line++;
	}
	close(C);
	line=1;
	while(getline x < D){
		file4[line]=x;
		line++;
	}
	close(D);

	for(i=1;i<93;i++){
		common=0;
		for(j=1;j<93;j++){
			if(file1[i]==file2[j]){
				common++;
				break;
			}
		}
		for(k=1;k<93;k++){
			if(file1[i]==file3[k]){
				common++;
				break;
			}
		}
		for(l=1;l<93;l++){
			if(file1[i]==file4[l]){
				common++;
				break;
			}
		}

		if(common==3)
			print file1[i];
	}
}