def count_char(string,char):
 
 count = 0
 for i in range(len(string)):
    if(string[i] == char):
        count = count + 1
 return count
def is_not_prime(n):
    import math
    
    result = False
    for i in range(2,int(math.sqrt(n)) + 1):
        if n % i == 0:
            result = True
    return result