int a[22] = {0};
int b[22] = {0};
scanf("%s",a);
int i = 0;
while(a[i] != '\0')
{
if((a[i]>='A' && a[i]<='Z') || (a[i]>='a' && a[i]<='z'))
b[i] = a[i];
i++;
}
printf("%s\n",b);
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