Serbian Genitive - Greetings from London, Part 1

What a lovely morning for such an easy Serbian Genitive photo lesson:
 
Dobro jutro iz sunčanog LondonA! Pogodite odakle šaljem pozdrave: ispod ili iznad mostA?

Добро јутро из сунчаног ЛондонА! Погодите одакле шаљем поздраве: испод или изнад мостА?

Good morning from sunny London! Guess where I am sending the greetings from: under or above the bridge?

Serbian Genitive with Masculine Singular

London and most (bridge) are two Masc. Sg. nouns in this case. What endings showed up when we used them after the prepositions:

1. iz = from
2. under / below = ispod
3. above / over = iznad

Yes, the answer is -A. So, if you are from the following cities/countries you will always  say "I am from ..."

• Ja sam  iz Londona / Beograda / Lisabona / Bostona / Čikaga (Čikago) / Sidneja / Frankfurta /Minhena / Beča / Pariza
• Moja mama je iz Perua / Irana / Iraka / Luksemburga / Portugala /Izraela