#include <stdio.h>

int main () {
  char s[200001] = "";
  
  int res = 0;
  
  long long ans = 0LL;
  long long mod_num = 998244353LL;
  
  int len = 0;
  int qcnt = 0;
  long long pow2[200001] = {};
  
  long long dp[200001][6] = {};
  
  res = scanf("%s", s);
  
  while (s[len] != '\0') {
    if (s[len] == '?') {
      qcnt++;
    }
    len++;
  }
  
  pow2[0] = 1LL;
  for (int i = 0; i < qcnt; i++) {
    pow2[i+1] = (pow2[i]*2LL)%mod_num;
  }
  
  for (int i = 0; i < len; i++) {
    if (s[i] == '0') {
      ans += (dp[i][1]*pow2[qcnt])%mod_num;
      ans += (dp[i][2]*pow2[qcnt-1])%mod_num;
      ans += (dp[i][4]*pow2[qcnt-1])%mod_num;
      ans += (dp[i][5]*pow2[qcnt-2])%mod_num;
      dp[i+1][0] = (dp[i][0]+1LL)%mod_num;
      dp[i+1][1] = dp[i][1];
      dp[i+1][2] = dp[i][2];
      dp[i+1][3] = dp[i][3];
      dp[i+1][4] = dp[i][4];
      dp[i+1][5] = dp[i][5];
    } else if (s[i] == '1') {
      dp[i+1][0] = dp[i][0];
      dp[i+1][1] = (dp[i][1]+dp[i][0])%mod_num;
      dp[i+1][2] = dp[i][2];
      dp[i+1][3] = dp[i][3];
      dp[i+1][4] = (dp[i][4]+dp[i][3])%mod_num;;
      dp[i+1][5] = dp[i][5];
    } else {
      ans += (dp[i][1]*pow2[qcnt-1])%mod_num;
      ans += (dp[i][2]*pow2[qcnt-2])%mod_num;
      ans += (dp[i][4]*pow2[qcnt-2])%mod_num;
      ans += (dp[i][5]*pow2[qcnt-3])%mod_num;
      dp[i+1][0] = dp[i][0];
      dp[i+1][1] = dp[i][1];
      dp[i+1][2] = (dp[i][2]+dp[i][0])%mod_num;
      dp[i+1][3] = (dp[i][3]+1LL)%mod_num;
      dp[i+1][4] = dp[i][4];
      dp[i+1][5] = (dp[i][5]+dp[i][3])%mod_num;
    }
  }
  
  printf("%lld\n", ans%mod_num);
  return 0;
}