Đáp án:

def cp (n):
    kq=0
    for i in range (1,n+1):
        if n==i*i:
            kq=1
    return kq
a=list(map(int,input().split()))
dem=0
tong=0
for i in range(0,len(a)):
    if cp(a[i])==1:
        dem=dem+1
        tong=tong+a[i]
if dem==0:
    print('-')
else:
    tbc=tong/dem
    print('%0.1f'%tbc)
Chúc bạn học tốt

`color(#FFFFFFff)(H)color(#E7E7E7ff)(o)color(#CFCFCFff)(r)color(#B7B7B7ff)(i)color(#9F9F9Fff)(z)color(#878787ff)(o)color(#6F6F6Fff)(n)`

import math

def cphuong(n):
    return math.sqrt(n) == round(math.sqrt(n))

n = int(input())
arr = [int(x) for x in input().split(" ")]
kq = [x for x in arr if cphuong(x)]

if not kq:
    print("-")
else:
    tbc = sum(kq) / len(kq)
    print(f"{tbc:.1f}")