#include <inttypes.h>
#include <limits.h>
#include <stdio.h>
 
int main(void)
{
  // count chars
  uintmax_t freq[1u << CHAR_BIT] = {0};
  for (int c; (c = getchar()) != EOF; )
    ++freq[(unsigned char)c];
 
  // print brackets' frequencies
  const unsigned char bracket[] = "{}()[]<>";
  for (size_t i = 0; i < sizeof bracket; ++i)
    if (freq[bracket[i]])
      printf("%c -> %ju\n", bracket[i], freq[bracket[i]]);
 
  return !feof(stdin); // success on eof
}
 

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