f = open("file.txt", 'r', encoding = "utf-8")
f_output = open("file2.txt", 'w', encoding = "utf-8")
i = 0
for line in f:
    a=line.split("\t")   
    try: 
        print(a[2]) 
    except IndexError:
        print("Empty field at line %s" % str(i))    
        i += 1
f.close()
f_output.close()