import java.io.*;
public class practice {
public static void main(string[] args) {
// todo auto-generated method stub
bufferedreader buf;
buf=new bufferedreader(new inputstreamreader(system.in));
try
{
string str=buf.readline();
for(int i=0;i<str.length();i++){
char ch = str.charat(i);
//system.out.println(ch);
if(!character.isletter(ch))
{
system.out.println("此字符不是字母");
}
else if(character.isletter(ch))
{
if (!character.islowercase(ch))
{
system.out.println("此字符是大写字母");
}
else if (character.islowercase(ch))
{
system.out.println("此字符是小写字母");
}
}
}
}
catch(exception e)
{
}
}
}
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