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class Solution {

public char firstUniqChar(String s) {

int arr[] = new int[26];

for(int i=0;i<s.length();i++)

{

arr[s.charAt(i)-'a']++;

}

for(int i=0;i<s.length();i++)

{

if(arr[s.charAt(i)-'a']==1)

{

return s.charAt(i);

}

}

return ' ';

}

}