class Solution {
    public boolean checkString(String s) {
        boolean isFound = false;
        
        for(int i=0; i<s.length(); i++){
            if(s.charAt(i) == 'b')
                isFound = true;
            
            if(isFound && s.charAt(i) == 'a')
                return false;
        }
        
        return true;
    }
}