char a[100];
    scanf("%[^\n]s",a);
    for(int i=0; a[i]; i++)
    {
        //char k=a[i]-32
        if(a[i]==' ') printf(" ");
        else if(a[i]>='A' and a[i]<='Z')
        {
            printf("%c",a[i]+32);
        }
        else if(a[i]>='a' and a[i]<='z')
        {
            printf("%c",a[i]-32);
        }
        else printf("%c",a[i]);
    }
    printf("\n");