Runtime error(NZEC) in Printer Queue(PQUEUE)

[vidyasagar_sof]

Hi,
i am getting runtime error (NZEC) in PQUEUE in python, the code was running fine in my computer. I have recently started programming in python, so I am unable to find my error. plz help me out.

Thanks in advance

while(1):
    try:
        t=raw_input()
    except EOFError:
        break
    t=int(t)
    while(t!=0):
        t=t-1
        cnt=0
        st=raw_input()
        g=st.find(' ')
        n=int(st[0:g])
        m=int(st[g+1:])
        #print n,m
        x=raw_input()
        #print x
        l=len(x)
        i=0
        while i<l :
            #print "i =", i
            if(x[i]==' '):
                x=x[0:i]+x[i+1:]
                l=l-1
            i=i+1
        a=x[m]
        while i<l:
            if x[i]<a:
                if i<m:
                    m=m-1
                l=l-1
            i=i+1
        a=int(a)
        for i in reversed(range(a+1,10)):
            #print "x=",x
            j=chr(i+ord('0'))
            cntt=x.count(j)
            if cntt==0:
                continue
            cnt=cnt+cntt
            l=0
            #print j,"cnt=",cnt
            while l<n:
                #print "l=",l,"n=",n
                if(x[l]==j):
                    if l<m:
                        m=m-1
                    n=n-1
                    x=x[0:l]+x[l+1:]
                    fal=l
                l=l+1
            x=x[fal:]+x[0:fal]
            #print "m",m,"n",n,"fal",fal
            m=m+n-fal
        #print "cnt",cnt,"m",m
        countmpos=x.count(x[m],0,m+1)
        #print countmpos
        cnt=cnt+countmpos
        print cnt