I am trying to count the string and I want to delete the key with value 1 and 2. I am successfully able to count the strings with below script. If I am adding if loop to the dictionary its throwing Key error 'd' when I try to print it. 

```
s = "aaabbbd"
def check_freq(s):
     freq = {}
     for c in s:
        freq[c] = s.count(c)
     for w in sorted(freq, key=freq.get, reverse=True):
         if freq[w] == 1:
             del freq[w]
             print (w, freq[w])

check_freq(s)

```

Error is below

```
File "<ipython-input-60-a79c71ac1b31>", line 10, in check_freq
    print (w, freq[w])

KeyError: 'd'

```

Expected output

> 
> {'a': 3, 'b': 3}
> 
> 
>