Smallest Substring - TESTCASES

#Author : Saurav Kalsoor
#Testcases for Smallest Substring

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// Testcase : 1

//Input :
10
yyxyyzzxyx

//Output :
3
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// Testcase : 2

//Input :
20
zyyyyzyzyzyyxxyxxyxy


//Output :
2
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// Testcase : 3

//Input :
30
zyzyzyxyyxzzxyyxzzxyyxzzxyzzyz

//Output :
7
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// Testcase : 4

//Input :
50
yyyyyzzzzyzzzzyzyyzyzyyyzzyzyyyzzyzzzyzyzzyzyzzzyy

//Output :
-1

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// Testcase : 5

//Input :
80
zxxyyxyyzxxzxzyyxzzxyzyzxxyxzzyyyyyxyzzxxxxzzxxyzzxzzxxzzxxzzxzzzyyxzzzzzyyzyxyz

//Output :
2
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// Testcase : 6

//Input :
100
xyzxyzxyzxyzxyzxyzxyzxyzxyzxyzxyzxyzxyzxyzxyzxyzxyzxyzxyzxyzxyzxyzxyzxyzxyzxyzxyzxyzxyzxyzxyzxyzzyzy

//Output :
4
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// Testcase : 7

//Input :
150
zyzyzyxyyxzzxyyxzzxyyxzzxyzzyzzyzyzyxyyxzzxyyxzzxyyxzzxyzzyzzyzyzyxyyxzzxyyxzzxyyxzzxyzzyzzyzyzyxyyxzzxyyxzzxyyxzzxyzzyzzyzyzyxyyxzzxyyxzzxyyxzzxyzzyz

//Output :
7
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// Testcase : 8

//Input :
180
zzyzzzyzyyzyyyyyzyyyzzyzzzyyyyzzyzyyyyzzzyzzzyyyzyzyzyzzzzzyyyzzyzyzyzzyyzyzzyzzyyyyzzyyyyzyyyzzyzyyzzyyzyzzzzzzyyyzzzyzzyyzyzzzyyzzzzzyzzzyyyyzyzyzzyzzzyzzzzzyzzyyyzzzzyzyzyyyzyzz

//Output :
-1
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// Testcase : 9

//Input :
400
xyzxyzxyzxyzxyzxyzxyzxyzxyzxyzxyzxyzxyzxyzxyzxyzxyzxyzxyzxyzxyzxyzxyzxyzxyzxyzxyzxyzxyzxyzxyzxyzzyzyxyzxyzxyzxyzxyzxyzxyzxyzxyzxyzxyzxyzxyzxyzxyzxyzxyzxyzxyzxyzxyzxyzxyzxyzxyzxyzxyzxyzxyzxyzxyzxyzzyzyxyzxyzxyzxyzxyzxyzxyzxyzxyzxyzxyzxyzxyzxyzxyzxyzxyzxyzxyzxyzxyzxyzxyzxyzxyzxyzxyzxyzxyzxyzxyzxyzzyzyxyzxyzxyzxyzxyzxyzxyzxyzxyzxyzxyzxyzxyzxyzxyzxyzxyzxyzxyzxyzxyzxyzxyzxyzxyzxyzxyzxyzxyzxyzxyzxyzzyzy

//Output :
4
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// Testcase : 10

//Input :
1000
xyxzxyxyxzxyxzxyxyxzxyxzxyxyxzxyxzxyxyxzxyxzxyxyxzxyxzxyxyxzxyxzxyxyxzxyxzxyxyxzxyxzxyxyxzxyxzxyxyxzxyxzxyxyxzxyxzxyxyxzxyxzxyxyxzxyxzxyxyxzxyxzxyxyxzxyxzxyxyxzxyxzxyxyxzxyxzxyxyxzxyxzxyxyxzxyxzxyxyxzxyxzxyxyxzxyxzxyxyxzxyxzxyxyxzxyxzxyxyxzxyxzxyxyxzxyxzxyxyxzxyxzxyxyxzxyxzxyxyxzxyxzxyxyxzxyxzxyxyxzxyxzxyxyxzxyxzxyxyxzxyxzxyxyxzxyxzxyxyxzxyxzxyxyxzxyxzxyxyxzxyxzxyxyxzxyxzxyxyxzxyxzxyxyxzxyxzxyxyxzxyxzxyxyxzxyxzxyxyxzxyxzxyxyxzxyxzxyxyxzxyxzxyxyxzxyxzxyxyxzxyxzxyxyxzxyxzxyxyxzxyxzxyxyxzxyxzxyxyxzxyxzxyxyxzxyxzxyxyxzxyxzxyxyxzxyxzxyxyxzxyxzxyxyxzxyxzxyxyxzxyxzxyxyxzxyxzxyxyxzxyxzxyxyxzxyxzxyxyxzxyxzxyxyxzxyxzxyxyxzxyxzxyxyxzxyxzxyxyxzxyxzxyxyxzxyxzxyxyxzxyxzxyxyxzxyxzxyxyxzxyxzxyxyxzxyxzxyxyxzxyxzxyxyxzxyxzxyxyxzxyxzxyxyxzxyxzxyxyxzxyxzxyxyxzxyxzxyxyxzxyxzxyxyxzxyxzxyxyxzxyxzxyxyxzxyxzxyxyxzxyxzxyxyxzxyxzxyxyxzxyxzxyxyxzxyxzxyxyxzxyxzxyxyxzxyxzxyxyxzxyxzxyxyxzxyxzxyxyxzxyxzxyxyxzxyxzxyxyxzxyxzxyxyxzxyxzxyxyxzxyxzxyxyxzxyxzxyxyxzxyxzxyxyxzxyxzxyxyxzxyxzxyxyxzxyxzxyxyxzxyxzxyxyxzxyxzxyxyxz

//Output :
3
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