convert integers to characters in string

[h7dra]

hello

i want to convert integers into characters,
with the rule 0>a,1>b,2>c,3>d,4>d,....

i mean: for example

int i=0
int j=3
str s

i want to have s="ad" !!!

how can i do that?
maybe something with character codes ( i saw that a~97,b~98,...)

Thanks

[Gintaras]

Code:

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int i=0
int j=3
str s="aa"
s[0]+i
s[1]+j
out s