def compress(in_str):
	comp_str= ""

	count=1
	for i in range(len(in_str)-1):
		if in_str[i] == in_str[i+1]:
			count += 1
		else:
			comp_str += in_str[i] + str(count)
			count= 1

	comp_str += in_str[i+1] + str(count)

	return comp_str