var lines = [];
var reader = require('readline').createInterface({
  input: process.stdin,
  output: process.stdout
});
reader.on('line', function (line) {
  lines.push(line);
  var s = lines[0];
  console.log((s.match(/mi-*n/g)||[]).length);
  process.exit(0);
});
process.stdin.on('end', function () {
});