For problem statement at 1000-1999/1400-1499/1490-1499/1494/problemE.txt this is a correct solution, but verifier at 1000-1999/1400-1499/1490-1499/1494/verifierE.go ends with All tests passed can you fix the verifier? ```go
package main

import (
	"bufio"
	"io"
	"os"
)

type FastScanner struct {
	data []byte
	idx  int
	n    int
}

func NewFastScanner() *FastScanner {
	data, _ := io.ReadAll(os.Stdin)
	return &FastScanner{data: data, n: len(data)}
}

func (fs *FastScanner) skip() {
	for fs.idx < fs.n && fs.data[fs.idx] <= ' ' {
		fs.idx++
	}
}

func (fs *FastScanner) NextByte() byte {
	fs.skip()
	b := fs.data[fs.idx]
	fs.idx++
	return b
}

func (fs *FastScanner) NextInt() int {
	fs.skip()
	x := 0
	for fs.idx < fs.n {
		b := fs.data[fs.idx]
		if b < '0' || b > '9' {
			break
		}
		x = x*10 + int(b-'0')
		fs.idx++
	}
	return x
}

func key(u, v int) uint64 {
	return uint64(uint32(u))<<32 | uint64(uint32(v))
}

func main() {
	fs := NewFastScanner()
	fs.NextInt()
	m := fs.NextInt()

	edges := make(map[uint64]byte, m*2)
	mutual := 0
	same := 0

	out := bufio.NewWriterSize(os.Stdout, 1<<20)

	for i := 0; i < m; i++ {
		t := fs.NextByte()

		if t == '+' {
			u := fs.NextInt()
			v := fs.NextInt()
			c := fs.NextByte()

			if rc, ok := edges[key(v, u)]; ok {
				mutual++
				if rc == c {
					same++
				}
			}
			edges[key(u, v)] = c
		} else if t == '-' {
			u := fs.NextInt()
			v := fs.NextInt()

			k := key(u, v)
			c := edges[k]
			if rc, ok := edges[key(v, u)]; ok {
				mutual--
				if rc == c {
					same--
				}
			}
			delete(edges, k)
		} else {
			k := fs.NextInt()
			if k&1 == 1 {
				if mutual > 0 {
					out.WriteString("YES\n")
				} else {
					out.WriteString("NO\n")
				}
			} else {
				if same > 0 {
					out.WriteString("YES\n")
				} else {
					out.WriteString("NO\n")
				}
			}
		}
	}

	out.Flush()
}
```