# Why does this code have trubles with a specific input?

I wrote this code and I found out it gives problem with specific inputs

```
def counter(w): #turns a list of classes into a list of cardinality of the classes
n=len(w)
s=[]
for i in range(n):
a=len(w[i])
s.append(a)
return s
str=[1,3,1,2,1,2,1,3,1]
def stringer(s,j): #computes mu(i)
n=len(s)
m=0
d=0
m=m+(s[j])
d=d+s[j]^2
for i in range(j+1):
for k in range(j,n):
if i!=k:
ss=0
for q in range(i,k+1):
ss=ss+s[q]
m=m+2*s[i]*s[k]/ss
d=d+2*s[i]*s[k]
w=m/d
return w
def mumaker(s): #makes the mu line
n=len(s)
m=[]
m = numpy.empty(n, dtype=object)
for j in range(n):
m[j]=stringer(s,j)
return(m)
def fuser(s,w,m): #aggregates elements with the same mu in s,w and m
g=[]
h=[]
n=len(m)
for j in range(n):
l=s[j]
r=w[j]
for i in range(j+1,n):
if m[i]==m[j]:
l=l+s[i]
r=r+w[i]
s[i]=0
m[i]=2
w[i]=0
g.append(l)
h.append(r)
return(g,h,m)
def orderer(s,w,m): #orderes the strings based on the mu
k=0
q=0
t=0
r=len(s)
n=[]
for j in range(r):
n=[]
for i in range(j,r):
n.append(m[i])
t=min(n)
for i in range(j,r):
if m[i]==t:
k=s[j]
q=w[j]
s[j]=s[i]
w[j]=w[i]
s[i]=k
w[i]=q
k=m[j]
m[j]=m[i]
m[i]=k
return(s,w)
def reducer(v): #removes the 0
w=[]
n=len(v)
for i in range(n):
if v[i]!=0:
w.append(v[i])
v=w
return(v)
def final(w):
str=counter(w)
n=mumaker(str)
[g,h,m]=fuser(str,w,n)
[p,q]=orderer(g,h,m)
k=reducer(p)
u=reducer(q)
return(k,u)
def cycler(w):
for i in range(10):
i=i+1
u=w
[k,w]=final(u)
print('New mu line cardinalities=',k, 'New mu line=', u)
if u==final(u)[1]:
print('Fuzzy grade=',i)
break
cycler(v)
```

This works fine with almost every input, for example v=[[0],[1],[2],[3],[4,5]]. However if I try inputs like v=[[0],[1],[2],[3],[4],[5]] or v=[[0,1],[2,3],[4,5]] (i.e. inputs in which every element has the same lenght) the following error comes up:

```
TypeError Traceback (most recent call last)
Input In [1], in <cell line: 134>()
130 print('Fuzzy grade=',i)
131 break
--> 134 cycler(v)
Input In [1], in cycler(w)
125 i=i+Integer(1)
126 u=w
--> 127 [k,w]=final(u)
128 print('New mu line cardinalities=',k, 'New mu line=', u)
129 if u==final(u)[Integer(1)]:
Input In [1], in final(w)
112 def final(w):
--> 113 str=counter(w)
114 n=mumaker(str)
115 [g,h,m]=fuser(str,w,n)
Input In [1], in counter(w)
7 s=[]
8 for i in range(n):
----> 9 a=len(w[i])
10 s.append(a)
11 return s
TypeError: object of type 'sage.rings.integer.Integer' has no len()
```

How can I solve this?