"""
Write a program that reads the string and counts the number of special characters in the string. 
"""

def main():
	my_str=input("enter string ")
	size=len(my_str)
	count_special=0
	for i in range(size):
		if(my_str[i].isalnum()==False): #if(not(my_str[i].isalnum()):
			count_special+=1

	print(count_special)
main()