The Mongolian Horizontal Square Script is an abugida (syllabic alphabet), so you don't need to write the letter "a" in words except at the beginning of the word. For example, the word "altan" (gold in mongolian) is written as al'tn'
' is used for marking a syllable-final consonant in
Mongolian. For example, "Bata" is spelled as bt, while "bat" is spelled as bt'
"A" is used for representing independent vowels in
combination with vowel signs. For example, the word "eke" (mother), is written as Aeke
An uppercase "C" is used for /ch/ letter, when the lowercase "c" is still /c/, /ts/ sound
An uppercase "S" is used for /sh/ letter, when the lowercase "s" is still /s/
An uppercase "N" is used for /ng/ letter, /ŋ/ sound, when the lowercase "n" is still /n/
An uppercase "Z" is used for the letter /zh/, when the lowercase "z" is still /z/
An uppercase "J" is used for /dz/ letter, when the lowercase "j" is still /j/
An uppercase "T" is used for /th/ letter, when the lowercase "t" is still /t/
Also, you will not be able to paste the resulting Mongolian text everywhere, not all support this script.