a = "Paris:Delhi:9945672345,Berlin:Brussels:9456723456"
for idx, leg in enumerate(a.split(","), 1):
src, dest, mob = leg.split(":")
sum = 0
for i in range(0, len(mob), 2):
sum += int(mob[i])
print("%s%s%i%i" % (src[0:2], dest[-2:], sum, idx))
YSA9ICJQYXJpczpEZWxoaTo5OTQ1NjcyMzQ1LEJlcmxpbjpCcnVzc2Vsczo5NDU2NzIzNDU2IgoKZm9yIGlkeCwgbGVnIGluIGVudW1lcmF0ZShhLnNwbGl0KCIsIiksIDEpOgogICAgc3JjLCBkZXN0LCBtb2IgPSBsZWcuc3BsaXQoIjoiKQogICAgc3VtID0gMAogICAgZm9yIGkgaW4gcmFuZ2UoMCwgbGVuKG1vYiksIDIpOgogICAgICAgIHN1bSArPSBpbnQobW9iW2ldKQogICAgcHJpbnQoIiVzJXMlaSVpIiAlIChzcmNbMDoyXSwgZGVzdFstMjpdLCBzdW0sIGlkeCkpCg==