import sys


from time import clock


try:
    input=open('in20_6.txt','r')
    OutFile=open('out_sec20_6.txt','w')
except IOError:
    print "The file does not exist"
input_value=[[],[],[]]
m=0
final=[]

for row in input:
    input_value[m]=row.split(",")
    m+=1
length1=len(input_value[0])
length2=len(input_value[1])
length3=len(input_value[2])
OutFile.write("The numbers that appear in at least two of the three lists are : "+"\n")


for i in range(0,length1,1):
    flag=0
    for j in range(0,length2,1):
        input_value[0][i]=input_value[0][i].rstrip("\n")
        input_value[1][j]=input_value[1][j].rstrip("\n")
        if input_value[0][i]==input_value[1][j]:
            if (input_value[0][i] not in final):
                    OutFile.write(input_value[0][i])
                    final.append(input_value[0][i])
            
            flag=1
            break
        else:
            flag=0
    if flag==0:
        for k in range(0,length3,1):
            input_value[0][i]=input_value[0][i].rstrip("\n")
            input_value[2][k]=input_value[2][k].rstrip("\n")
            if input_value[0][i]==input_value[2][k]:
                if (input_value[0][i] not in final):
                    OutFile.write(input_value[0][i])
                    final.append(input_value[0][i])
                break
for i in range(0,length2,1):
    for j in range(0,length3,1):
        input_value[1][i]=input_value[1][i].rstrip("\n")
        input_value[2][j]=input_value[2][j].rstrip("\n")

        if input_value[1][i]==input_value[2][j]:
            if (input_value[1][i] not in final):
                    OutFile.write(input_value[1][i])
                    final.append(input_value[1][i])
            flag=1
            break

input.close()
OutFile.close()

print "Output file is generated !!!!!"