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Input : lst = [15, 6, 7, 10, 12, 20, 10, 28, 10]
       x = 10
Output : 3

def countX(lst, x): 
    count = 0
    for ele in lst: 
        if (ele == x): 
            count = count + 1
    return count 

lst = [8, 6, 8, 10, 8, 20, 10, 8, 8] 
x = 8
print(countX(lst, x))

5

def countX(lst, x): 
    return lst.count(x) 

lst = [8, 6, 8, 10, 8, 20, 10, 8, 8] 
x = 8
print(countX(lst, x))

5