0 OP = 1
10 FOR N = 0 TO 25 : GOSUB 100 : NEXT
20 FOR N = 250 TO 265 : GOSUB 100 : NEXT
30 FOR N = 1000 TO 1025 : GOSUB 100 : NEXT
40 END

100 GOSUB 200"NTH
110 PRINT NTH$ " ";
120 RETURN

200 M1 = N - INT(N / 10) * 10
210 M2 = N - INT(N / 100) * 100
220 NTH$ = "TH"
230 IF M1 = 1 AND M2 <> 11 THEN NTH$ = "ST"
240 IF M1 = 2 AND M2 <> 12 THEN NTH$ = "ND"
250 IF M1 = 3 AND M2 <> 13 THEN NTH$ = "RD"
260 IF NOT OP THEN NTH$ = "'" + NTH$
270 NTH$ = STR$(N) + NTH$
280 RETURN