from time import clock
import sys
def section15_7():
    f=open("in15_7.txt","r")
    f1=open("Out_27_15_7.txt","w")
    temp = f.readline().split(',')
    j=0   
    temp2=[]
    memory=0
    memory=sys.getsizeof(f)+sys.getsizeof(f1)+sys.getsizeof(temp)+sys.getsizeof(temp2)
    start=clock()
    for i in range(1,len(temp)):
        if int(temp[i])==i:
            temp2.append(i)
            j=j+1
    end=clock()-start
    memory+=sys.getsizeof(start)+sys.getsizeof(end)
    if j==0:
        f1.write("Does not exist"+"\n")
    else:
        for k in temp2:
            f1.write(str(k))
    f1.write("Time required is "+str(end)+"\n")
    f1.write("Memory required is "+str(memory)+" Bytes"+"\n")
    f.close()
    f1.close()
section15_7()