multiplying str or int

[lXlXlXlXlXlXl]

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int i=1
str j="LOG"
j+i ;; = LOG1
rep 5
,j+1 ;;i want the number in the value j to increase by 1 each rep eg: LOG1 LOG2 LOG3 LOG4
,out j ;; but im getting eg: LOG11 LOG111 LOG1111 LOG11111
,